JA Solar (JASO) 20-F 27 Apr 15 2014 FY Annual report (foreign) Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2014
Document and Entity Information
Entity Registrant Name	JA Solar Holdings Co., Ltd.
Entity Central Index Key	1385598
Document Type	20-F
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding	252,301,917
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	2,155,009	2,119,740
Restricted cash	833,084	588,413
Notes receivable	74,984	207,224
Accounts receivable from third party customers, net	2,079,465	748,414
Accounts receivable from related party customers, net	382,276	295,697
Inventories	1,886,268	1,347,094
Advances to third party suppliers, net	277,595	288,472
Advances to related party suppliers, net	60,000	113,000
Amount due from related parties	47,890	43,436
Other current assets	713,763	536,134
Deferred tax assets	90,169	64,409
Total current assets	8,600,503	6,352,033
Property, plant and equipment, net	4,166,747	4,158,108
Project assets, net	651,494	47,746
Intangible asset, net	12,728	14,423
Deferred tax assets	148,522	58,050
Advances to third party suppliers, net	441,559	753,310
Advances to related party suppliers, net	10,145	603
Prepaid land use rights	438,556	448,619
Investment in joint venture and affiliates	13,524	48,802
Total assets	14,483,778	11,881,694
Current liabilities:
Short-term borrowings and current portion of long term borrowings	2,297,533	2,058,515
Accounts payable to third parties	2,439,097	1,570,850
Accounts payable to related parties	331,202	311,781
Tax payables	79,562	11,028
Advances from third party customers	243,959	191,428
Advances from related party customers		11,295
Other payables to third parties	693,371	482,270
Payroll and welfare payables	234,168	202,743
Accrued expenses	147,294	166,054
Amounts due to related parties	8,115	3,814
Derivatives liabilities - warrants	105,785	31,106
Total current liabilities	6,580,086	5,040,884
Accrued warranty costs	251,740	158,897
Other long-term liabilities	282,684	269,575
Long-term borrowings	1,902,400	1,554,000
Derivatives liabilities - warrants		154,259
Total liabilities	9,016,910	7,177,615
Commitments and Contingencies
Shareholders' equity :
Ordinary shares(US$0.0001 par value; 500,000,000 shares authorized, 227,499,837 and 252,301,917 shares issued and outstanding as of December 31, 2013 and December 31, 2014, respectively)	186	170
Additional paid-in capital	5,638,703	5,327,177
Statutory reserves	436,807	410,150
Accumulated deficit	-726,610	-1,123,724
Accumulated other comprehensive income	11,086	6,489
Total shareholders' equity attributable to JA Solar Holdings	5,360,172	4,620,262
Noncontrolling interest	106,696	83,817
Total shareholders' equity	5,466,868	4,704,079
Total liabilities and shareholders' equity	14,483,778	11,881,694

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Ordinary shares, par value (in dollars per share)	$0.00	$0.00
Ordinary shares, shares authorized	500,000,000	500,000,000
Ordinary shares, shares issued	252,301,917	227,499,837
Ordinary shares, shares outstanding	252,301,917	227,499,837

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS)/ INCOME (CNY)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Solar modules	9,291,940	4,388,251	4,043,609
Solar cells and other products	1,824,813	2,385,770	2,357,101
Engineering, procurement and construction	22,643	27,875	135,810
Solar products processing	156,127	380,893	182,545
Total revenues	11,295,523	7,182,789	6,719,065
Cost of revenues
Solar modules	-7,843,582	-3,861,178	-4,029,047
Solar cells and other products	-1,594,345	-2,254,007	-2,476,893
Engineering, procurement and construction	-8,252	-16,045	-84,726
Solar products processing	-92,849	-289,270	-182,757
Total cost of revenues	-9,539,028	-6,420,500	-6,773,423
Gross (loss)/profit	1,756,495	762,289	-54,358
Selling, general and administrative expenses	-954,307	-765,236	-901,645
Research and development expense	-139,683	-88,306	-86,429
Impairment loss on property, plant and equipment			-397,789
Total operating expenses	-1,093,990	-853,542	-1,385,863
(Loss)/Income from continuing operations	662,505	-91,253	-1,440,221
Change in fair value of derivatives	84,484	-51,867	9,334
Convertible notes buyback gain/(loss)			-8,466
Interest expense	-229,665	-285,618	-489,346
Interest income	28,213	17,091	36,226
Foreign exchange loss	-61,822	-43,828	-24,519
(Loss)/income for equity investment in a joint venture	3,211	-2,108	-43,501
Other income, net	33,114	16,064	398,861
(Loss)/income before income taxes	520,040	-441,519	-1,561,632
Income tax (expense)/benefit	-73,390	15,027	-100,625
Net (loss)/income	446,650	-426,492	-1,662,257
Less: earnings attributable to the noncontrolling interest	-22,879	-2,788
Net (loss)/income attributable to JA Solar Holdings	423,771	-429,280	-1,662,257
Less: fair value of warrants in excess of net proceeds of equity offering		-44,396
Less: allocation of net income to participating warrant holder	-77,174
Net (loss)/income attributable to JA Solar's ordinary shareholders	346,597	-473,676	-1,662,257
Other comprehensive (loss)/income:
Foreign currency translation adjustments, net of tax	4,597	9,507	218
Cash flow hedging income/(loss), net of tax	0	0	-11,755
Other comprehensive (loss)/income	4,597	9,507	-11,537
Comprehensive (loss)/income	451,247	-416,985	-1,673,794
Less: comprehensive income attributable to the noncontrolling interest	-22,879	-2,788
Comprehensive (loss)/income attributable to JA Solar Holdings	428,368	-419,773	-1,673,794
Less: fair value of warrants in excess of net proceeds of equity offering		-44,396
Less: allocation of net income to participating warrant holder.	-77,174
Comprehensive (loss)/income attributable to JA Solar's ordinary shareholders	351,194	-464,169	-1,673,794
Net (loss)/income per share:
Basic (in CNY per share)	1.43	-2.35	-8.53
Diluted (in CNY per share)	1.38	-2.35	-8.53
Weighted average number of shares outstanding :
Basic (in shares)	242,192,859	201,317,884	194,788,429
Diluted (in shares)	242,863,084	201,317,884	194,788,429
Net (loss)/income per ADS:
Basic (in dollars per share)	7.17	-11.76	-42.67
Diluted (in dollars per share)	6.88	-11.76	-42.67
Weighted average number of ADS:
Basic (in shares)	48,438,572	40,263,577	38,957,685
Diluted (in shares)	48,572,617	40,263,577	38,957,685

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY	Total JA Solar Holdings shareholders' equity	Ordinary shares.	Additional paid-in capital	Statutory reserves	Retained earnings/(deficit)	Accumulated other comprehensive Income/(loss)	Non-controlling interest	Total	Total
In Thousands, except Share data, unless otherwise specified	CNY	CNY	CNY	CNY	CNY	CNY	CNY		CNY
Balance at Dec. 31, 2011		154	5,102,362	420,301	1,017,333	8,519			6,548,669
Balance (in shares) at Dec. 31, 2011		202,238,307
Increase (Decrease) in Shareholders' Equity
Share based compensation			33,225						33,225
Vesting of restricted share units (in shares)		95,000
Repurchase and retirement of ADS		-1			-15,275				-15,276
Repurchase and retirement of ADS (in shares)		-2,469,700
Reversal of statutory reserves				-3,654	3,654
Net (loss)/income					-1,662,257				-1,662,257
Other comprehensive income for foreign currency translation adjustment						218			218
Other comprehensive income for forward contract (Note 21)						-11,755			-11,755
Balance at Dec. 31, 2012	4,892,824	153	5,135,587	416,647	-656,545	-3,018			4,892,824
Balance (in shares) at Dec. 31, 2012		199,863,607
Increase (Decrease) in Shareholders' Equity
Share based compensation	9,401		9,401						9,401
Vesting of restricted share units (in shares)		1,281,890
Exercise of stock options	3,389		3,389						3,389
Exercise of stock options (in shares)		401,750
Reversal of statutory reserves				-6,497	6,497
Acquisition of a subsidiary(Note 3)							81,029		81,029
Issuance of ordinary shares, net of warrants issuance (Note 22)	9	9							9
Issuance of ordinary shares, net of warrants issuance (Note 22) (in shares)		15,228,425
Exercise of warrants (Note 22)	178,808	8	178,800						178,808
Exercise of warrants (Note 22) (in shares)		10,724,165
Fair value of warrants in excess of net proceeds of equity offering (Note 22)	-44,396				-44,396				-44,396
Net (loss)/income	-429,280				-429,280		2,788		-426,492
Other comprehensive income for foreign currency translation adjustment	9,507					9,507			9,507
Other comprehensive income for forward contract (Note 21)									0
Balance at Dec. 31, 2013	4,620,262	170	5,327,177	410,150	-1,123,724	6,489	83,817		4,620,262
Balance (in shares) at Dec. 31, 2013		227,499,837							227,499,837
Increase (Decrease) in Shareholders' Equity
Share based compensation	16,281		16,281						16,281
Vesting of restricted share units (in shares)		85,000
Exercise of stock options	2,171		2,171						2,171
Exercise of stock options (in shares)		268,750
Reversal of statutory reserves				26,657	-26,657
Exercise of warrants (Note 22)	293,090	16	293,074						293,090
Exercise of warrants (Note 22) (in shares)		24,448,330
Fair value of warrants in excess of net proceeds of equity offering (Note 22)									-44,396
Net (loss)/income	423,771				423,771		22,879		446,650
Other comprehensive income for foreign currency translation adjustment	4,597					4,597			4,597
Other comprehensive income for forward contract (Note 21)									0
Balance at Dec. 31, 2014	5,360,172	186	5,638,703	436,807	-726,610	11,086	106,696		5,360,172
Balance (in shares) at Dec. 31, 2014		252,301,917							252,301,917

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net (loss)/income	446,650	-426,492	-1,662,257
Adjustments to reconcile net loss to net cash provided by operating activities:
Share based compensation	16,281	9,401	33,225
Depreciation and amortization	685,345	595,792	657,082
Allowance for doubtful accounts	15,383	91,016	187,130
Inventory provision	15,073	119,936	171,165
Allowance for advance to third party suppliers	56,980	10,392	64,298
Amortization of deferred issuance cost and accretion of convertible notes		35,030	135,725
Change in fair value of derivatives	-84,484	51,867	11,485
Gain on acquisition of a subsidiary	-4,628
Loss/(income) for equity investment in a joint venture	441	2,108	43,501
Revaluation gain from acquisition of a subsidiary	-3,652
Exchange loss/(gain)	-850	-261	13,004
Loss/(gain) from disposal of fixed assets	16,831	-950	1,878
Impairment on property, plant and equipment			397,789
Deferred income taxes	-116,232	-28,489	-1,350
Loss from convertible notes buyback			8,466
Gain on sale of claim against loaned shares			-369,153
Changes in operating assets and liabilities:
(Increase)/decrease in notes receivables	132,240	-58,263	271,254
(Increase)/decrease in accounts receivables from third party customers	-1,346,434	847,518	-660,190
Decrease /(increase) in accounts receivables from related party customers	-86,579	-196,481	-5,126
Decrease /(increase) in inventories	-551,171	-500,761	-370,667
Decrease in advance to third party suppliers	265,094	175,581	428,076
Decrease /(increase) in advance to related party suppliers	43,458	-2,586	-56,005
Decrease /(increase) in other current assets	-167,030	256,591	34,516
Increase in prepaid land use rights		-225,410
Increase/(decrease) in accounts payable	887,668	598,716	608,442
(Decrease)/increase in tax payable	81,723	-80,819	67,277
(Decrease)/increase in advance from customers	41,236	125,848	-243,402
Increase in other payables	105,044	90,385	59,030
(Decrease)/increase in payroll and welfare payables	31,499	7,363	8,743
Increase/(decrease) in accrued expenses	-18,669	-60,821	73,620
Decrease in interest payable		-4,123	-3,746
Increase/(decrease) in amounts due to related parties	4,301	-6,019	3,057
Increase in accrued warranty costs	92,843	44,671	35,475
Increase/(decrease) in other long-term liabilities	-32,192	-6,063	66,280
Net cash provided by operating activities	526,169	1,464,677	8,622
Cash flows from investing activities:
Purchase of property, plant and equipment	-649,624	-381,657	-526,236
Proceeds from disposal of property, plant and equipment	6,420	3,668	4,711
Purchase of intangible assets	-945	-5,561	-2,702
Investments in project assets	-473,663	-8,405
Government grants received	45,300	126,900
Proceeds from disposal of a subsidiary	-3,038
Cash paid for acquisition of a subsidiary, net of cash acquired	-38,945	45,109
Cash paid for purchase of an equity investee	-13,600
Decrease/(increase) in restricted cash	-244,671	-394,034	-105,747
Net cash used in investing activities	-1,372,766	-613,980	-629,974
Cash flows from financing activities:
Proceeds from short-term borrowings	2,913,292	1,534,339	1,974,577
Proceeds from long-term borrowings	1,810,400		538,000
Repurchase of convertible notes			-617,937
Repayment of convertible notes		-740,027
Proceeds from sales of claim against loaned shares			369,153
Proceeds from issuance of ordinary shares		128,529
Proceeds from issuance of ordinary shares upon exercise of warrants	286,747	143,107
Repurchase of ADS			-15,276
Repayment of short-term borrowings	-1,758,307	-1,411,716	-1,535,478
Repayment of long-term borrowings	-2,377,034	-1,429,547	-946,000
Proceeds from exercise of stock options	2,171	3,389
Net cash provided by/(used in) financing activities	877,269	-1,771,926	-232,961
Effect of exchange rate changes on cash and cash equivalents	4,597	9,507	-3,317
Net increase/(decrease) in cash and cash equivalents	35,269	-911,722	-857,630
Cash and cash equivalents at the beginning of the year	2,119,740	3,031,462	3,889,092
Cash and cash equivalents at the end of the year	2,155,009	2,119,740	3,031,462
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	290,026	300,282	243,332
Cash paid for income tax	121,088	84,377	40,007
Supplemental schedule of non-cash investing and financing activities:
Purchases of property, plant and equipment included in other payables	195,069	221,232	357,543
Purchases of project assets included in other payables	134,667
Project assets transferred from inventories		39,341

ORGANIZATION_AND_PRINCIPAL_ACT

ORGANIZATION AND PRINCIPAL ACTIVITIES	12 Months Ended
	Dec. 31, 2014
ORGANIZATION AND PRINCIPAL ACTIVITIES
ORGANIZATION AND PRINCIPAL ACTIVITIES	1.ORGANIZATION AND PRINCIPAL ACTIVITIES
	The accompanying consolidated financial statements include the financial statements of JA Solar Holdings Co., Ltd. (the “Company”), and its subsidiaries, collectively referred to as the “Group”.
	JA Solar Holdings Co., Ltd. was incorporated in the Cayman Islands on July 6, 2006. In February 2007, the Company’s ADS became listed on the NASDAQ Global Market in the United States. The Group is primarily engaged in the development, production and marketing of high-performance photovoltaic (“PV”) solar cells and solar power products, which convert sunlight into electricity, in the PRC.
	In November 2011, the Company completed the acquisition of 100% equity interest of Silver Age Holdings Limited (“Silver Age”), of which Full Shine Holdings Limited (“Full Shine”) and Solar Silicon Valley Electronic Science and Technology Co., Ltd. (“Solar Silicon Valley”) are 100% owned subsidiaries. Thereafter, Silver Age, Full Shine and Solar Silicon Valley became wholly owned subsidiaries of the Company.
	In January 2013, the Company completed the acquisition of 65% equity interest of Hebei Ningjin Songgong Semiconductor Co., Ltd. (“Ningjin Songgong”).
	March 2011, the Company entered into a joint venture agreement with MEMC Singapore to form a jointly-owned company named JA MEMC (Yangzhou) Solar Technology Company Ltd. (“JA MEMC”). In June 2014, the Company completed the acquisition of 50% of JA MEMC’s total equity interests held by MEMC Singapore. Thereafter, JA MEMC became wholly owned subsidiary of the Company. Subsequently, JA MEMC’s assets were transferred to JA Yangzhou and JA MEMC was dissolved in December 2014.
	Majority of the Group’s business is conducted through the operating subsidiaries established in the PRC, JingAo Solar Co., Ltd. (“JA Hebei”), JA Solar Technology Yangzhou Co., Ltd. (“JA Yangzhou”), Shanghai JA Solar Technology Co., Ltd. (“JA Fengxian”), Hefei JA Solar Technology Co., Ltd. (“JA Hefei Technology”), Solar Silicon Valley and Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. (“JA Lianyungang”), in which the Company indirectly holds a 100% interest.
	As of December 31, 2014, the Company’s principal subsidiaries include the following entities:
		Date of Incorporation/Acquisition	Place of	Percentage
			Incorporation	of Ownership
	JingAo Solar Co., Ltd. (“JA Hebei”)	May 18, 2005	PRC	100	%
	JA Development Co., Ltd. (“JA BVI”)	July 6, 2006	BVI	100	%
	Shanghai JA Solar Technology Co., Ltd. (“JA Fengxian”)	November 16, 2006	PRC	100	%
	JA Solar USA Inc. (“JA USA”)	April 13, 2007	USA	100	%
	Shanghai JA Solar PV Technology Co., Ltd. (“JA Zhabei”)	June 22, 2007	PRC	100	%
	JA Solar Technology Yangzhou Co., Ltd. (“JA Yangzhou”)	November 19, 2007	PRC	100	%
	JA Solar Hong Kong Limited (“JA Hong Kong”)	December 10, 2007	Hong Kong	100	%
	Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. (“JA Lianyungang”)	October 11, 2008	PRC	100	%
	JA Yangzhou PV Technology Co., Ltd. (“JA Yangzhou PV”)	November 23, 2009	PRC	100	%
	JA Solar GmbH (“JA GmbH”)	February 17, 2010	Germany	100	%
	Shanghai Jinglong Solar Technology Co., Ltd. (“JA Jinglong”)	July 5, 2010	PRC	100	%
	Donghai JA Solar Technology Co., Ltd. (“JA Wafer R&D”)	November 4, 2010	PRC	100	%
	JA (Hefei) Renewable Energy Co., Ltd. (“JA Hefei Renewable Energy”)	March 30, 2011	PRC	100	%
	Hefei JA Solar Technology Co., Ltd. (“JA Hefei Technology”)	July 8, 2011	PRC	100	%
	JA Solar Investment China Co., Ltd (“JA Investment”)	October 31, 2011	PRC	100	%
	Silver Age Holdings Limited (“Siliver Age”)	November 30, 2011	BVI	100	%
	Full Shine Holdings Limited (“Full Shine”)	November 30, 2011	Hong Kong	100	%
	Solar Silicon Valley Electronic Science and Technology Co., Ltd. (“Solar Silicon Valley”)	November 30, 2011	PRC	100	%
	JA Solar Japan Limited (“JA Japan”)	July 12, 2012	Japan	100	%
	Dunhuang JA Solar Power Development Co., Ltd (“JA Dunhuang”)	July 23, 2012	PRC	100	%
	Hebei Ningjin Songgong Semiconductor Co., Ltd. (“Ningjin Songgong”)	January 29, 2013	PRC	65	%
	JA Solar Investment (Hong Kong) Limited	May 16, 2013	Hong Kong	100	%
	JA Solar Australia PTY Limited	June 12, 2013	Australia	100	%
	JA Solar PV Technology Co., LTD	January 13, 2014	PRC	100	%
	JA Solar PV Electric (Shexian) Co,. Ltd	March 10, 2014	PRC	100	%
	Aiyouen Power Electric (Yinchuan) Co,. Ltd	March 25, 2014	PRC	65	%
	JA Solar PV Electric (Baotou) Co,. Ltd	March 26, 2014	PRC	100	%
	JA Solar Iriki Power Plant Limited	April 10, 2014	Japan	100	%
	Beijing JA Solar PV Technology Co., Ltd.	April 14, 2014	PRC	100	%
	JA Solar PV Electric (Huanghua) Co,. Ltd	July 1, 2014	PRC	100	%
	JA Powerway South Africa Proprietary Limited	July 5, 2014	South Africa	65	%
	JA Solar PV Electric (Yanchi) Co,. Ltd	July 17, 2014	PRC	100	%
	JA New Energy Development (Hebei) Co., Ltd.	August 25, 2014	PRC	100	%
	JA Solar PV Electric (Juxian) Co,. Ltd	August 26, 2014	PRC	100	%
	2432243 Ontario Corp	September 1, 2014	Canada	100	%
	JA Solar PV Electric (Chifeng) Co,. Ltd	October 20, 2014	PRC	100	%
	JA Solar PV Electric (Wulanchabu) Co,. Ltd	November 12, 2014	PRC	100	%
	JA New Energy (Xilinhaote) Co,. Ltd .	December 4, 2014	PRC	100	%
	JA Solar Malaysia Sdn. Bhd.	December 10, 2014	Malaysia	100	%
	JA Solar PV Electric (LaiWu) Co,. Ltd	December 30, 2014	PRC	100	%

Summary_of_significant_account

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2014
Summary of significant accounting policies
Summary of significant accounting policies	2.Summary of significant accounting policies
	a)Basis of presentation and consolidation
	The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). The consolidated financial statements include the financial statements of the Company and its subsidiaries. For consolidated subsidiaries where the Company’s ownership in the subsidiary is less than 100%, the equity interest not held by the Company is presented as noncontrolling interest. All inter-company transactions and balances among the Company and its subsidiaries have been eliminated upon consolidation.
	b)Use of estimates
	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. The Company bases its estimates on historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Significant accounting estimates reflected in the Company’s consolidated financial statements include allowance for doubtful accounts and advances to suppliers, valuation of inventories, derivative and other financial instruments, useful lives of long-lived assets, assumptions used to measure impairment of long-lived assets and equity method investment, determination of fair value of identifiable assets and liabilities acquired through business combination, accrual for warranty and other liabilities, provision for uncertain tax positions and deferred tax valuation allowances, loss contingency, provision for inventory purchase commitment and assumptions used in the computation of share-based compensation, including the associated forfeiture rates.
	c)Fair value of financial instruments
	The Company estimated the fair value of its financial assets and liabilities in accordance with ASC 820, Fair Value Measurements and Disclosure. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (also referred to as an exit price). ASC 820 establishes a hierarchy for inputs used in measuring fair value that gives the highest priority to observable inputs and the lowest priority to unobservable inputs. Valuation techniques used to measure fair value shall maximize the use of observable inputs.
	When available, the Company measures the fair value of financial instruments based on quoted market prices in active markets, valuation techniques that use observable market-based inputs or unobservable inputs that are corroborated by market data. Pricing information the Company obtains from third parties is internally validated for reasonableness prior to use in the consolidated financial statements. When observable market prices are not readily available, the Company generally estimates the fair value using valuation techniques that rely on alternate market data or inputs that are generally less readily observable from objective sources and are estimated based on pertinent information available at the time of the applicable reporting periods. In certain cases, fair values are not subject to precise quantification or verification and may fluctuate as economic and market factors vary and the Company’s evaluation of those factors changes. Although the Company uses its best judgment in estimating the fair value of these financial instruments, there are inherent limitations in any estimation technique. In these cases, a minor change in an assumption could result in a significant change in its estimate of fair value, thereby increasing or decreasing the amounts of the Company’s consolidated assets, liabilities, shareholders’ equity and net income or loss.
	d)Cash, cash equivalents and restricted cash
	The Group considers all cash on hand and demand deposits as cash and considers all highly liquid investments with an original maturity of three months or less as cash equivalents. Restricted cash as of December 31, 2013 and 2014 represents amounts held by banks, which are not available for the Group’s use, as collateral for issuance of letters of credit, letters of guarantee, bank acceptance notes as well as certain borrowings.
	e)Investments
	Investments in entities where the Group does not have a controlling financial interest, but have the ability to exercise significant influence over the operating and financial policies of the investee, are accounted for using the equity method of accounting. Investment in a joint venture or an affiliate is accounted for by the equity method of accounting as the Group has the ability to exercise significant influence but does not own a majority equity interest. Under the equity method of accounting, the Group’s share of the investee’s results of operations is included in equity gain/(loss) for the investee in the Group’s Consolidated Statements of Operations and Comprehensive (Loss)/Income. Unrealized gains on transactions between the Company and the joint venture or affiliate are eliminated to the extent of the Group’s interest in the joint venture or affiliate, if any; unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the asset transferred. When the Group’s share of losses in the joint venture or affiliate equals or exceeds its interest in the joint venture or affiliate, the Group does not recognize further losses, unless the Group has incurred obligations or made payments on behalf of the joint venture or affiliate.
	f)Account receivables and allowance for doubtful accounts
	Provisions are made against accounts receivable for estimated losses resulting from the inability of the Group’s customers to make payments. The Group periodically assesses accounts receivable balances to determine whether an allowance for doubtful accounts should be made based upon historical bad debts, specific customer creditworthiness and current economic trends. Accounts receivables in the balance sheets are stated net of such provision.
	The Group assesses the credit line and credit term for each customer, taking into consideration the credit worthiness of such customer, the payment history of such customer and macro-economic conditions of the regional market. The Group signs the sales contract and executes the transaction with the customer after sufficient credit assessment. After the sales are made, the Group closely monitors the collectability of receivables on an on-going basis for any subsequent changes in the customers’ financial position and credit rating, and any relevant circumstances which may impact collectability of the receivables. The Group generally will not enter into further transactions with any customers with significant overdue balances.
	g)Inventories
	Inventories are stated at the lower of cost or market value. Cost of inventories is determined by the weighted-average method. Cost of work-in-progress and finished goods are comprised of direct materials, direct labor and related manufacturing overhead based on normal operating capacity. Adjustments are recorded to write down the carrying amount of any obsolete and excess inventory to its estimated net realizable value. Certain factors could impact the realizable value of inventory, so the Group continually evaluates the recoverability based on assumptions about customer demand and market conditions. The evaluation may take into consideration historical usage, expected demand, anticipated sales price, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, customer concentrations, and other factors. The write-down is equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand and market conditions.  If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required that could negatively impact the Group’s gross margin and operating results. If actual market conditions are more favorable, the Group may have higher gross margin when products that have been previously written down are eventually sold.
	The Company assesses whether losses should be accrued on long-term inventory purchase commitments in accordance with ASC 330-10-35-17 to 18, which requires that losses that are expected to arise from those firm, non-cancellable, and unhedged commitments for the future purchase of inventory items, measured in the same way as inventory losses, should be recognized unless recoverable through firm sales contacts or when there are other circumstances that reasonably assure continuing sales without price decline.
	Under the long-term supply contracts (“LTAs”) between the Company and certain suppliers, polysilicon and silicon wafer purchase would be made pursuant to the purchase prices and quantities set forth in the relevant LTAs. As a result of the significant declines in the market prices of polysilicon and silicon wafer due to the significant downturn in the solar industry in recent years, the purchase prices set forth in certain LTAs exceeded market prices.
	At the end of each reporting period, the Company separately assesses the potential losses on those firm inventory purchases for each supplier. When making the assessment, the Company considers whether it is able to renegotiate with its suppliers and get positive outcome by taking into account various considerations, such as stated contract price, purchase price reduction, overall amendment to LTA to eliminate fixed price arrangement, its ability to obtain concessions (i.e., reduced purchase prices and/or additional quantities at no cost) so that the actual purchase prices are less than the stated contract prices or close to the market price at the time of purchase, historical outcome of the renegotiation with the same supplier, contract period, the minimum purchase quantity, tax costs involved in the import or export of raw materials and products, status of a particular LTA at the time of assessment, and other circumstances and uncertainties that may impact such assessment.
	If it is determined that a loss provision calculation is necessary considering the status of a LTA and all facts and circumstances impacting the evaluation, the Company follows the guidance of ASC 330-10-35-17 and assesses whether there should be loss on the firm purchase commitments by applying a methodology similar to that used in the lower of cost or market evaluation with respect to inventory. In assessing the potential loss provision, the Company uses the stated contract price and volume under the relevant LTA as the major assumptions. Loss provision will be provided if the net realizable value after considering estimated costs to convert those polysilicon into saleable finished goods is higher than market selling price of finished goods as of the end of a reporting period
	There was no loss provision recorded related to these long-term contracts in the years ended December 31, 2012, 2013 and 2014. (Refer to Note 7 Inventories)
	h)Short-term and long-term advances to suppliers
	The Group provides short-term and long-term advances to secure its raw material needs, which are then offset against future purchases. The Group does not require collateral or other security against its advances to related or third party suppliers. The Group continually assesses the credit quality of its suppliers and the factors that affect the credit risk. If there is deterioration in the creditworthiness of its suppliers, the Group will seek to recover its advances from the suppliers and provide for losses on advances which are akin to receivables in selling, general and administrative expenses because of their inability to return its advances. Recoveries of the allowance for advances to supplier are recognized when they are received. The Group classified short-term and long-term advances to suppliers based on management’s best estimate of the expected purchase in the next twelve-months as of the balance sheet date and the Group’s ability to make requisite purchases under existing supply contracts. The balances expected to be utilized outside of the twelve months are recorded in long-term advances to suppliers.
	i)Prepaid land use rights
	Land use rights are carried at cost less accumulated amortization and impairment losses, if any.  Amortization is provided on a straight-line basis over the lease period of 40 or 50 years.
	j)Property, plant and equipment, net
	Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is provided on a straight-line basis over the following estimated useful lives:
	Buildings	20 years
	Leasehold improvements	Shorter of the lease term or their estimated useful lives
	Machinery and equipment	5-15 years
	Furniture and fixtures	5 years
	Motor vehicles	5 years
	Construction in progress primarily represents the construction of new production lines. Costs incurred in the construction are capitalized and transferred to property, plant and equipment when an asset is ready for its intended use, at which time depreciation commences. Interest expense incurred for qualifying assets are capitalized in accordance with ASC 835-20, Capitalization of Interest.
	Expenditures for repairs and maintenance are expensed as incurred. The gain or loss on disposal of property, plant and equipment, if any, is the difference between the net sales proceeds and the carrying amount of the disposed assets, and is recognized in the Consolidated Statements of Operations and Comprehensive Loss upon disposal.
	k)Operating leases
	Leases where substantially all the rewards and risks of ownership of assets remain with the leasing company are accounted for as operating leases. Payments made under operating leases are charged to the Consolidated Statements of Operations and Comprehensive Loss on a straight-line basis over the lease periods.
	l)Business combination
	Business combinations are accounted for under the acquisition method in accordance with ASC 805, Business Combinations. The consideration transferred is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date, irrespective of the extent of any non-controlling interests. The excess of the (i) the fair value of consideration transferred , fair value of the non controlling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree is recorded as goodwill. If the fair value of consideration transferred, fair value of the non-controlling interests and acquisition date fair value of any previously held equity interest in the acquire is less than the fair value of the net assets of the entity acquired, the difference, a bargain purchase, is recognized as a gain directly in the Statements of Operations and Comprehensive Loss upon obtaining control. In a business combination achieved in stages, the acquirer shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in earnings.
	The determination and allocation of fair values to the identifiable assets acquired and liabilities assumed, including non-controlling interests if applicable, is based on various assumptions and valuation methodologies requiring considerable management judgment.  The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. Management determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets and forecasted life cycle and forecasted cash flows over that period. Although management believes that the assumptions applied in the determination are reasonable based on information available at the date of acquisition, actual results may differ from the forecasted amounts and the difference could be material.
	m)Intangible asset, net
	Intangible assets primarily represent technical know-how, purchased accounting and operational software, and customer relationships acquired through business combinations.
	Technical know-how, contributed by one of the Group’s shareholders upon formation of JA Hebei, is carried at cost, less accumulated amortization. The technical know-how consists of one component relating to the commercial production process of photovoltaic solar cells. Amortization is calculated on a straight-line basis over the estimated useful life of eight years.
	Intangible assets acquired through business combinations are recognized as assets separate from goodwill if they satisfy either the “contractual-legal” or “separability” criterion. Customer relationship is recorded at fair value at the acquisition date less accumulated amortization. Amortization is calculated on a straight-line basis over the estimated useful life of five years.
	Purchased software and others with a finite useful life is being amortized on a straight line basis over its estimated useful life of three to ten years.
	n)Impairment of long-lived assets
	The Group evaluates its long-lived assets and finite-lived intangible asset for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Factors considered important that could result in an impairment review include significant underperformance relative to expected historical or projected future operating results, significant changes in the manner of use of acquired assets and significant negative industry or economic trends. Impairments are recognized based on the difference between the fair value of the asset and its carrying value in the event that the carrying amount exceeds the estimated future undiscounted cash flow attributed to such assets. Fair value is generally measured based on either quoted market prices, if available, or discounted cash flow analyses. Additionally, determining fair values requires probability weighting the cash flows to reflect expectations about possible variations in their amounts or timing and the selection of an appropriate discount rate. Although cash flow estimates are based on relevant information available at the time the estimates are made, estimates of future cash flows are, by nature, highly uncertain and may vary significantly from actual results. Any write-downs would be treated as permanent reductions in the carrying amounts of the assets and an operating loss would be recognized.
	o)Income taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax assets bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided to reduce the carrying amount of deferred tax assets if it is considered more likely than not that some portion, or all, of the deferred tax assets will not be realized.
	Uncertain tax position is accounted for in accordance with ASC 740-10-25, which clarifies the accounting for uncertain tax positions and requires that the Company recognizes in the consolidated financial statements the impact of an uncertain tax position, if that position is more likely than not of being sustained upon examination, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company’s accounting policy is to accrue interest and penalties related to uncertain tax positions, if and when required, as interest expense and a component of general and administrative expenses, respectively, in the Consolidated Statements of Operations and Comprehensive Loss. In the years ended December 31, 2012, 2013 and 2014, the Group did not record any interest and penalties associated with uncertain tax positions as there were no uncertain tax positions.
	p)Revenue recognition
	(i)Revenue recognition for solar modules, solar cells and other products (hereafter “solar products”)
	The Group recognizes revenue from the sale of solar products when the goods are delivered and title and risk of loss transfer is passed to the customers. The Group sells its solar products at agreed upon prices to its customers, which reflect prevailing market prices.
	The Group’s considerations for recognizing revenue are based on the following:
		·		Persuasive evidence that an arrangement (sales contract) exists between a willing customer and the Group that outlines the terms of the sale (including customer information, product specification, quantity of goods, purchase price and payment terms). Customers do not have a right of return. The Group does provide a warranty on its solar module products.
		·		For EX Works (“EXW”) terms, which mean that a seller has the goods ready for collection at its premises (works, factory, warehouse, plant),  the contract specifies that the risks are assumed by the customer when the customer picks up the goods from the Company’s warehouse, at which time revenue is recognized. For FOB shipping point terms, the contract specifies that the customer takes title to the goods and is responsible for all risks and rewards of ownership once products are over shipping rail at the named loading port from the Company’s premises, at which time revenue is recognized. For CIF terms, the Company pays the costs of insurance and freight necessary to bring the goods to the named port of destination, but the title to and risk/rewards of ownership of the goods is passed to the buyer according to each of the contract term, which is defined in each contract. For Delivered Duty Paid (“DDP”) terms, the Company pays the costs of insurance and freight necessary to bring the goods to the named port of destination as well as the import duty, and the title to and risk/rewards of ownership of the goods is passed to the buyer once the goods are delivered and the import duty is paid. The point of delivery could be at the port of shipping, or it could also be when the goods arrive at the named port of destination. When title to the goods transfers at the port of shipping, the beneficiary of the insurance is the buyer and the Company has no obligations to the buyer if goods are damaged during shipping. Revenue is therefore, recognized when the title to and risk/rewards of ownership of the goods is passed to the buyer which is at port of shipping or port of destination, depending on the terms of the contract.
		·		The Group’s price to the customer is fixed and determinable as specifically outlined in the sales contract.
		·		For customers to whom credit terms are extended, the Group assesses a number of factors to determine whether collection from the customers is reasonably assured, including past transaction history with these customers and their credit-worthiness. All credit extended to customers is pre-approved by management. If the Group determines that collection is not reasonably assured, including cases where the customers retain a portion of the full contract price as retainage after a specific period, it defers the recognition of revenue until such criterion is met, which is generally upon receipt of payment.
	(ii)Revenue recognition for solar products processing
	The Group provides solar products processing services to customers with their own wafer/polysilicon supplies. Under certain of these solar products processing service arrangements, the Group purchases raw materials from a customer and agrees to sell a specified quantity of solar products produced from such materials back to the same customer. The Group records revenue from these processing transactions on a net basis, recording revenue based on the amount received for solar products sold less the amount paid for the raw materials purchased from the customer.
	(iii)Revenue recognition for engineering, procurement and construction services
	The Group recognizes revenue using the percentage of completion method for systems integration projects for which the Group provides engineering, procurement and construction (“EPC”) services under the EPC contracts. The Group estimates its revenues by using the cost-to-cost method, whereby it derives a ratio by comparing the costs incurred to date to the total costs expected to be incurred on the project. The Group applies the ratio computed in the cost-to-cost analysis to the contract price to determine the estimated revenues earned in each period. The Group uses this method because management considers costs incurred to be the best available measure of progress on these contracts and management believes it has the ability to reasonably estimate and track costs. When the Group determines that total estimated costs will exceed total revenues under a contract, it records a loss accordingly. No contract losses were recorded in the years ended December 31, 2012, 2013 and 2014. In the situation where payments under the EPC contracts to be received from the customer depend on the customer’s financing from other parties, revenue is recognized only when payments are received and other revenue recognition criteria are met. When EPC revenue is deferred as a result of not meeting all the revenue recognition criteria, the Group assesses whether related costs incurred can be deferred by considering recoverability of costs taken into consideration of contract terms and other relevant factors.
	q)Cost of revenue
	Cost of revenue — solar products
Cost of revenue for solar products includes production related direct labor, direct material cost , depreciation and amortization, indirect costs, shipping (freight in) and handling costs for products sold, inventory obsolescence and lower of cost or market charge, capacity underutilization charges and warranty cost. .
Cost of revenue - solar products processing
Cost of revenue for solar products processing includes direct labor, depreciation and amortization, indirect costs, and shipping and handling costs.
Cost of revenue - engineering, procurement and construction services
Costs of revenue for engineering, procurement and construction services include all direct material, labor, subcontractor cost, and those indirect costs related to contract performance, such as indirect labor, supplies and tools. The Group recognizes job material costs as incurred costs when the job materials have been installed. The Group considers job materials to be installed materials when they are permanently attached or fitted to the solar power systems as required by the engineering design.
r)Project assets
Project assets consist primarily of direct costs relating to solar power projects in various stages of development. A project asset is initially recorded at the actual cost. For a self-developed project asset that is initially obtained by application of feed-in-tariff (“FIT”) contract and other required permits, consents, the actual cost capitalized is the amount of the expenditure incurred for the application of those contracts, permits, consents, material and labor costs, capitalized interest and other similar direct costs. For a project asset acquired from external parties, the initial cost is the acquisition cost which includes the consideration transferred and certain direct acquisition cost. Modules cost, equipment cost and development and others incurred in the project development process will build up the cost of project assets.
		As of December 31,		As of December 31,
		2013		2014
		RMB		RMB
Project assets-Modules cost		39,341		325,640
Project assets-Equipment cost		—		128,805
Project assets-Development and Others		8,405		197,049
Total Project assets		47,746		651,494
The Company reviews project assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. In determining whether or not the project assets are recoverable, the Company considers a number of factors, including changes in environmental, ecological, permitting, marketing price or regulatory conditions that affect the project. Such changes may cause the cost of the project to increase or the selling price of the project to decrease. No impairment of the project assets was recorded in the years ended December 31, 2013 and 2014.
Costs capitalized in the construction of solar power plants under development will be transferred to solar power plants upon completion and when they are ready for its intended use, which is at the point when the solar power plant is connected to grids and begins to generate electricity. Depreciation of the completed solar power plant commences once the solar power plant is ready for its intended use. Depreciation will be computed using the straight-line method over the expected life. As of December 31, 2014, no solar power plant of the Company is ready for its intended use.
As of December 31, 2014, project assets with net book value of RMB 310,029 were pledged as collateral for the Group’s borrowings of RMB 200,000 from Industrial and Commercial Bank of China.
s)Share based compensation
In accordance with ASC 718, Compensation-Stock Compensation, the Group measures the cost of employee services received in exchange for share-based compensation at the grant date fair value of the award.
The Group recognizes the share-based compensation costs, net of a forfeiture rate, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards.
ASC 718 requires forfeitures to be estimated at the time of grant and revised in subsequent periods if actual forfeitures differ from those estimates.
t)Research and development
Research and development costs are expensed when incurred.
u)Advertising expenses
Advertising expenses are expensed when incurred. Advertising expenses are not significant during any of the periods covered by these consolidated financial statements.
v)Warranty cost
Solar modules produced by the Group are typically sold with a 10-year guarantee for defects in materials and workmanship and a 10-year and 25-year warranty against declines of more than 10.0% and 20.0%, respectively, of the initial minimum power generation capacity at the time of delivery. The Group therefore maintains warranty reserves (recorded as accrued warranty costs) to cover potential liabilities that could arise from these guarantees and warranties. The potential liability is generally in the form of product replacement or repair. The Group accrues 1.0% of its net revenues attributable to module sales as warranty costs at the time revenues are recognized and include that amount in its cost of revenues. Due to limited warranty claim history, the Group accrues the estimated costs of warranties based on its own history, industry data and an assessment of its competitors’ accrual history. Through the Group’s relationships with, and its management’s experience working at, other solar power companies and on the basis of publicly available information regarding other solar power companies’ accrued warranty costs, the Group believes that accruing 1.0% of its net revenues attributable to module sales as warranty costs is within the range of industry practice and is consistent with industry-standard accelerated testing, which assists the Group in estimating the long-term reliability of solar modules, estimates of failure rates from its quality review and other assumptions that it believes to be reasonable under the circumstances. However, although the Group conducts quality testing and inspection of its solar module products, these products have not been and cannot be tested in an environment simulating the up to 25-year warranty periods. Actual warranty costs are accumulated and charged against the accrued warranty liability. To the extent that the actual warranty costs differ from the estimates, the Group will prospectively revise its accrual rate.
w)Foreign currencies translation
The functional and reporting currency of the Company and the majority of its subsidiaries is Renminbi (“RMB”). Transactions denominated in other currencies are translated into RMB at the exchange rates quoted by the People’s Bank of China (the “PBOC”)  prevailing when the transactions occur. Monetary assets and liabilities denominated in other currencies are translated into RMB at rates of exchange in effect at the balance sheet dates. All exchange gains and losses are included in the Consolidated Statements of Operations and Comprehensive (Loss)/Income as a separate line item after income/(loss) from operations.
For the Company’s subsidiaries whose functional currency is not RMB, the asset and liability accounts are translated into RMB, its reporting currency, using exchange rates in effect at the balance sheet dates, equity accounts are translated at historical exchange rates, and income and expense items are translated using average exchange rates. Translation adjustments are reported as cumulative translation adjustments and are shown as a separate component of accumulative other comprehensive income, net of tax, in the Consolidated Statements of Operations and Comprehensive (Loss)/Income.
x)Segment reporting
The Group has adopted ASC 280, Segment Reporting, for its segment reporting. The Group operates and manages its business as a single segment. The Group’s chief decision-maker (“CODM”), which is identified as the Chief Executive Officer, reviews operating results to make decision about allocating resources and assessing performance for the entire company.
y)Commitments and Contingencies
Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated.
z)Earnings/(loss) per share
In accordance with ASC 260, Earnings Per Share, basic earnings/(loss) per share is computed by dividing net income/(loss) attributable to ordinary shareholders by the weighted average number of ordinary shares outstanding during the year. Under the two-class method, net income is allocated between ordinary shares and other participating securities (i.e. warrants) based on their participating rights. Diluted earnings/(loss) per share is calculated by dividing net income/(loss) attributable to ordinary shareholders, as adjusted for the change in income or loss resulting from the assumed conversion of those participating securities, if any, by the weighted average number of ordinary shares and dilutive ordinary share equivalents outstanding during the year. Ordinary share equivalents consist of the ordinary shares issuable upon the conversion of the senior convertible notes (using the if-converted method) and ordinary shares issuable upon the exercise of outstanding share options and RSUs (using the treasury stock method). Potential dilutive securities are not included in the calculation of dilutive earnings per share if the effect is anti-dilutive.
aa)Other Comprehensive income/(loss)
The Group has adopted ASC 220, Comprehensive Income. ASC 220 defines other comprehensive income/(loss) to include all changes in equity, including adjustments to minimum pension liabilities, accumulated foreign currency translation, unrealized gains or losses on available-for-sale marketable securities, and unrealized hedging gain/(loss) to the extent effective, except those resulting from investments by owners and distributions to owners.
ab)Accounting for share lending arrangement
The Company accounts for share lending arrangement in accordance with ASU 2009-15, Accounting for Own-Share Lending Arrangements in Contemplation of Convertible Debt Issuance or Other Financing, which requires an entity that enters into an equity-classified share lending agreement, utilizing its own shares, in contemplation of a convertible debt issuance or other financing to initially measure the share lending arrangement at fair value and treat it as a cost of the financing. In addition, if it becomes probable that the counterparty to the arrangement will default, the issuer shall recognize an expense for the fair value of the unreturned shares, net of probable recoveries.
ac)Share repurchase
When the shares are repurchased for retirement, the excess of cost over par value is charged entirely to retain earnings.
ad)Recent accounting pronouncements
In April 2014, the FASB issued Accounting Standards Update No. 2014-08 ‘‘Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity’’. The new guidance changes the criteria for reporting discontinued operations while enhancing disclosures in this area. Under the new guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. Additionally, ASU 2014-08 requires expanded disclosures about discontinued operations that will provide financial statement users with more information about the assets, liabilities, income, and expenses of discontinued operations. The new guidance also requires disclosure of the pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. ASU 2014-08 is effective for the Company in the first quarter of fiscal 2015. Early adoption is permitted, but only for disposals (or classifications as held for sale) that have not been reported in financial statements previously issued or available for issuance. The Group is in the process of evaluating the impact of the standard on its consolidated financial statements.
In May 2014, the FASB issued Accounting Standards Update No. 2014-09 (‘‘ASU 2014-09’’), ‘‘Revenue from Contracts with Customers (Topic 606)’’.  ASU 2014-09 will eliminate transaction-specific and industry-specific revenue recognition guidance under current U.S. GAAP and replace it with a principle-based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. Entities can transition to the standard either retrospectively or as a cumulative effect adjustment as of the date of adoption. The Group is in the process of evaluating the impact of the standard on its consolidated financial statements.

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2014
Acquisition
Acquisition	3.Acquisition
	a)Acquisition of Ningjin Songgong
	M.SETEK Co., Ltd (“M.SETEK”), one of the largest suppliers located in Japan, failed to make majority of scheduled delivery since March 2011 after a magnitude-9 earthquake struck Japan and triggered a tsunami affecting vast areas in Japan. Although the production capacity of M.SETEK has returned to normal since November 2011, the Group elected to claim the outstanding prepayment from M.SETEK pursuant to the contract. In order to settle the prepayments, the Group reached a settlement agreement with M.SETEK on March 8, 2012 that M.SETEK used its dividend distribution from Ningjing Songgong, its 65%-owned subsidiary located in PRC, to repay part of the prepayments amounting to RMB 69,500, and also transfer its 65% equity interests in Ningjin Songgong at fair value amount of RMB 247,000 (“equity interest transfer price”) to the Group. For the remaining portion of the prepayment of RMB 128,687, M.SETEK will deliver polysilicon at market price to the Group until the prepayment is fully utilized. Ningjin Songgong is a private company which is 65% owned by M. SETEK and 32.7% owned Mr. Baofang Jin, the Group’s Chairman, and 2.3% owned by a few third party individuals. Ningjin Songgong is primarily engaged in production of solar-grade monocrystalline silicon ingot.
	The share transfer agreement was formally signed on July 23, 2012 and the transaction was subject to approval by relevant government. Considering a continued decrease in selling price of solar products and recession of solar industry, the Group determined an impairment analysis is required in the year ended December 31, 2012. The Group estimated the fair value of the to be received equity interest of Ningjing Songgong as of December 31, 2012, based on discounted cash flow analysis using market participants’ assumptions, such as forecasts of future operating results, discount rates commensurate with the risk involved, and expected future growth rates.  As a result, in the year ended December 31, 2012, an impairment provision of RMB 96,517 was provided against prepayment made to M. SETEK, as the fair value of the equity interest in Ningjin Songgong based on discounted future cash flows analysis exceeds the equity interest transfer price, which was based on the fair value of equity interest in Ningjing Songgong at the time of settlement in March 2012.
	On January 29, 2013, M.SETEK transferred its 65% equity interest in Ningjin Songgong to the Group upon obtaining relevant government approval for a total consideration of RMB 150,483. The group started consolidating Ningjing Songgong effective February 1, 2013 and recognized the non-controlling interest related to the transaction.
	Purchase price allocation
	The total purchase price was allocated to Ningjin Songgong’s tangible assets, identifiable intangible assets, and assumed liabilities based on their estimated fair values as set forth below. The Group makes estimates and judgments in determining the fair value of the acquired assets and assumed liabilities, based on its experience with similar assets and liabilities in similar industries. In performing the purchase price allocation, the Group considered the analyses of historical financial performance and estimates of future performance of Ningjin Songgong’s business.
			As of January 31, 2013(1)
			RMB
	Assets acquired:
	Cash and cash equivalents		45,109
	Accounts receivable		138,516
	Short term prepayment		18,221
	Inventory		75,473
	Other current assets		34,702
	Long term prepayment		18,826
	Property, plant and equipment, net (2)		69,785
	Total assets acquired		400,632
	Liabilities
	Short-term borrowings		24,100
	Accounts payable		45,822
	Other payables		57,376
	Payroll and welfare payable		41,244
	Accrued expenses		578
	Total liabilities assumed		169,120
	Total fair value of net assets		231,512
	Less: Non-controlling interest		81,029
	Fair value of purchase consideration		150,483
		(1) The acquisition was completed on January 29, 2013. Considering the nominal financial impact of the two days from January 30 to January 31, 2013, we used January 31, 2013 as the acquisition date and the fair value assessment was made based on the financial information as of January 31, 2013.
		(2) The fair value of property, plant and equipment was recognized and measured at fair value using discounted future cash flow method.  Accumulated depreciation was not carried forward.
	Ningjin Songgong contributed net revenues of RMB 158,179 and net loss of RMB 5,178 from February 1, through December 31, 2013. The following table summarizes unaudited pro forma results of operations for the years ended December 31, 2012 and 2013, as if the acquisition of Ningjin Songgong had occurred on January 1, 2012, and after giving effect to acquisition accounting adjustments.
			Year ended		Year ended
			December 31,		December 31,
			2012		2013
			RMB		RMB
			(Unaudited)		(Unaudited)
	Pro forma revenue		6,845,610		7,197,985
	Pro forma net loss		(1,727,001	)	(425,155	)
	Pro forma loss attributable to holders of common shares		(1,687,720	)	(428,005	)
	Pro forma loss per share:
	Basic		(8.66	)	(2.13	)
	Diluted		(8.66	)	(2.13	)
	Weighted average number of shares used in computation:
	Basic		194,788,429		201,317,884
	Diluted		194,788,429		201,317,884
	The unaudited pro forma consolidated results of operations is for illustrative purpose only and do not purport to be indicative of the results that would have been achieved if the above acquisition had actually taken place on January 1, 2012, and may not be indicative of future operating results. The unaudited pro forma net loss includes RMB 17,236 and RMB 17,236 for the reduction of depreciation expenses of property, plant and equipment the years ended December 31, 2012 and 2013, respectively.
	b)Acquisition of JA MEMC
	In June 2014, the Group acquired additional 50% equity interests in JA MEMC (Yangzhou) Technology Co., Ltd. (“JA MEMC”) held by a joint venture partner for a consideration of RMB 47.4 million (USD 7.7 million) in cash.  The Group previously owned 50% equity interest in JA MEMC and accounted for its investment in JA MEMC using equity method of accounting since 2011. (refer to Note 4). The transaction is assessed as business combination and was completed on June 18, 2014, the date on which JA obtained control of JA MEMC.
	Upon completion, JA MEMC became a wholly-owned subsidiary of the Group. As a result of the acquisition, revaluation gain of RMB 3,652 was recognized in other income, representing the difference of the fair value of previously held 50% equity and the then carrying amount of that investment. In addition, a negative goodwill of RMB 4,628 was recognized and recorded as other income, reflecting the excess of the fair value of the identified net assets of the acquiree and the consideration transferred. Immediately after the acquisition, JA MEMC transferred all of its assets and liabilities to JA Yangzhou and was dissolved in December, 2014. The Group fully consolidated JA MEMC after the completion of the equity transfer until its dissolution.
	Purchase price allocation
	The total purchase price was allocated to JA MEMC’s tangible assets, identifiable intangible assets, and assumed liabilities based on their estimated fair values as set forth below. The Group makes estimates and judgments in determining the fair value of the acquired assets and assumed liabilities, based on its experience with similar assets and liabilities in similar industries. In performing the purchase price allocation, the Group considered the analyses of historical financial performance and estimates of future performance of JA MEMC’s business.
			As of June 24, 2014
			RMB
	Assets acquired:
	Cash and cash equivalents		8,426
	Other current assets		13,260
	Property, plant and equipment, net (1)		83,025
	Total assets acquired		104,711
	Liabilities
	Accounts payable		697
	Other liabilities		2
	Total liabilities assumed		699
	Total fair value of net assets		104,012
		-1		The fair value of property, plant and equipment was recognized and measured at fair value using discounted future cash flow method.  Accumulated depreciation was not carried forward.
JA MEMC contributed revenues of RMB 40,996 or 0.4% of total revenue from June 24, 2014 through December 31, 2014.

Investments_in_joint_venture_a

Investments in joint venture and affiliates	12 Months Ended
	Dec. 31, 2014
Investments in joint venture and affiliates
Investments in joint venture and affiliates	4.Investments in joint venture and affiliates
	a)Investment in JA MEMC
	In March 2011, the Group entered into a joint venture agreement with SunEdison Products Singapore Pte.Ltd. (“SunEdison”), (formerly known as MEMC Singapore Pte.Ltd.,) to form a jointly-owned company JA MEMC, to build and operate a solar cell production facility in China. Pursuant to the joint venture agreement, JA Yangzhou and SunEdison each contributed a capital investment of RMB 96,211 in cash, which represents 50% of the share capital of JA MEMC. The Group accounts for its investment in the joint venture using the equity method and the Group’s share of JA MEMC’s results of operations is included in equity gain/(loss) for a joint venture in the Group’s Consolidated Statements of Operations and Comprehensive (Loss)/Income. The Group’s equity in net loss of JA MEMC amounted to RMB 5,501, RMB 2,108 and RMB 441 for the year ended December 31, 2012, 2013 and 2014.
	The Group reviews its investment in JA MEMC to determine whether a decline in fair value below the carrying value, if any, is other- than-temporary. The assets held by JA MEMC consist primarily of long-lived assets and as of December 31, 2012, JA MEMC was still in the process of pre-operation. Based on all available information, such as industry-specific condition and investee-specific reasons, the Group determined that an other-than-temporary loss in the carrying value of the investment occurred and an impairment charge of RMB 38,000 should be recorded against the investment in JA MEMC in the year ended December 31, 2012. No impairment loss occurred in 2013 and 2014. Although assumptions used in estimates of fair value of the investment in JA MEMC are management best estimates, such assumptions are, by nature, highly judgmental and may vary significantly from actual results.
	As disclosed in Note 3, the Group acquired additional 50% equity interests in JA MEMC in June 2014, and started to consolidate JA MEMC since then.
	b)Investment in Lincheng
	JA Solar PV Electric (Lincheng) Co., Ltd. (“Lincheng”), a company 100% owned by JA, was set up in 2013, for the purpose of construction of power plants. Lincheng was undertaking early stage of development of a power plant with 100 MW capacity.
	In July 2014, JA entered into sales agreement with China Rich Energy Cooperation Ltd (“Rich Energy”). Under the agreement, Rich Energy contributed cash as the capital injection to Lincheng to acquire 80% equity interest of Lincheng.  JA deconsolidated Lincheng and starts to account for its investment of 20% in Lincheng as equity method of accounting because JA has significant influence, but does not have voting control over Lincheng since July 2014. By the end of 2014, Rich Energy has paid total cash of RMB 66.4 million in full as capital injection and all necessary legal procedures related to the share ownership were finished. JA has paid total cash of RMB 16.6 million in full as capital injection.
	From Oct 2014 to Dec 2014, the Group sold modules to Lincheng with the revenue of Rmb 115.4 million and cost of Rmb 100.0 million. Since JA hold 20% share of Lincheng, the 20% of the unrealized profit with an amount of Rmb 3.1 million reversed the long term investment balance. The balance of long-term investment in Lincheng was Rmb 13.5 million after the deduction of unrealized profit.

Notes_Receivable

Notes Receivable	12 Months Ended
	Dec. 31, 2014
Notes Receivable
Notes Receivable	5.Notes Receivable
	Notes receivable represents bank drafts that are non-interest bearing and due within six months. Such bank drafts have been arranged with third-party financial institutions by certain customers to settle their purchases from the Group. The carrying amount of notes receivable approximate its fair values. There is no allowance against notes receivable as of December 31, 2013 and 2014.

Accounts_Receivable_net

Accounts Receivable, net	12 Months Ended
	Dec. 31, 2014
Accounts Receivable, net
Accounts Receivable, net	6.Accounts Receivable, net
	Accounts receivable, net, consists of accounts receivables less allowance for doubtful accounts. The following table presents the movement of the allowance for doubtful accounts:
		As of December 31,		As of December 31,		As of December 31,
		2012		2013		2014
		RMB		RMB		RMB
	Balance at beginning of the year	32,591		189,971		280,987
	Allowance made during the year	200,446		125,691		71,104
	Recoveries	(13,316	)	(34,675	)	(55,721	)
	Amount written off against the allowance	(29,750	)	—		(20,844	)
	Balance at end of the year	189,971		280,987		275,526
	The Group assesses creditworthiness of customers before granting any credit terms. This assessment is primarily based on reviewing of customer’s financial statements and historical collection records, discussion with customers’ senior management, and reviewing of information provided by third parties, such as Dun & Bradstreet and the insurance company that ultimately insures the Group against customer credit default. During the year ended December 31, 2014, for sales of solar cells, the Group provided credit terms of up to 90 days to customers with good credit-worthiness as determined by the Group’s credit assessment. For sales of solar modules, which generally require a longer credit terms according to industry practice, credit terms of up to 180 days were granted to customers with good credit-worthiness. For the year ended December 31, 2012, 2013 and 2014, provisions, net of recoveries, of RMB 187,130, RMB 91,016 and RMB 15,383, respectively, were made against accounts receivable for estimated losses resulting from the inability of the customers to make payments as well as a few customers that had financial and operational difficulties.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventories
Inventories	7.Inventories
	Inventories consisted of the following:
			As of December 31,		As of December 31,
			2013		2014
			RMB		RMB
	Raw materials		522,302		603,110
	Work-in-progress		71,676		130,055
	Finished goods		753,116		1,153,103
	Total		1,347,094		1,886,268
	For the year ended December 31, 2012, 2013 and 2014, inventories were written down by RMB 171,165, RMB 119,936 and RMB 15,073, respectively, to reflect the lower of cost or market or obsolescence.
	In the periods presented, the Company renegotiated with certain suppliers on shipment quantities and pricing terms of long-term purchase arrangements and got positive outcome on a periodic basis, as described follows: Although the quantities under the purchase commitments of the LTAs are fixed, the Company negotiated and executed amendments for current purchases on a quarterly or monthly basis with those suppliers. As a result of such monthly or quarterly negotiations, suppliers either (i) agreed to lower the purchase price for the relevant month or quarter to a level that is close to the market price and significantly lower than the stated contract price, or (ii) agreed to deliver additional quantities to the Company for free during the relevant month or quarter in exchange for the Company’s agreement to purchase the stated quantity at the stated price under the LTAs for such month or quarter, which cumulatively resulted in the Company purchasing quantities larger than stated under the LTAs but at an average purchase price that was close to market price during such month or quarter.
	At the end of the reporting period, the Company separately assesses the potential losses, if any, on the aforementioned LTAs taking into consideration of the factors as mentioned above, as well as additional factors, such as the renegotiation outcome in current period, contract period, historical outcome of the renegotiation with the same supplier, status of a particular LTA at the time of assessment, and other circumstances and uncertainties that may impact such assessment.
	There was no loss provision recorded related to these LTAs after considering all the factors and circumstances for the applicable LTAs in the years ended December 31, 2012, 2013 and 2014.
	When preparing the Company’s consolidated financial statements, the Company separately assessed, in accordance with ASC 330-10-35-17 and -18, the potential losses on the firm purchase commitments to one supplier (“Supplier D”), to whom the Company failed to make a full advance payment and to perform under its purchase obligations in 2013 and 2014 under the supply contract. The Company entered into a LTA with Supplier D in March 2011. While the contract provides for purchases at fixed price and fixed quantities starting from 2013 to 2020, the Company did not make a full advance payment according to the contract and accept any delivery in 2013 and 2014 due to the significant decrease of silicon price in the market and the uncertainty brought by anti-dumping and anti-subsidy investigation (the “Investigation”) against polysilicon imported from the U.S. and South Korea initiated by the Chinese Ministry of Commerce (“MOFCOM”) in recent years and MOFCOM’s ruling in 2014 that investigated products from South Korea and the United States are subject to import tariffs at different rates with the highest rate being 57%. As of the date of this report, the Company is still in the process of renegotiating with Supplier D on various terms, such as the unit price, quantities and delivery schedule.
	When preparing the consolidated financial statements for the year ended and as of December 31, 2013 and 2014, the Company considered the following factors in assessing whether it should accrue losses on long-term inventory purchase commitments to Supplier D:
		·		Although currently the Company is still in the process of renegotiating with Supplier D and such process has been slowed down due to uncertainties related to anti-dumping and anti-subsidy investigation and ruling, both parties continues to constructively dialogue to find a mutually satisfactory solution.
		·		The Company has been able to renegotiate with other suppliers with similar terms to get positive outcome; and the Company has history of renegotiating similar contacts with the same suppliers, and
	The Company assessed whether there would be loss on firm purchase commitments by applying a methodology similar to that used in the lower of cost or market evaluation with respect to inventory. In assessing the potential loss provision, the Company used the stated contract price, volume under the LTA with Supplier D as the major assumption to perform the analysis. A comprehensive analysis for estimated net realizable value of the saleable finished goods, after considered all estimated costs which include conversion costs, shipping costs, costs for build-up, fees for breakage, and third party processing costs, is lower than market selling price of finish goods as of December 31, 2014.  Even though the purchase price as stated in the LTA is higher than market price of polysilicon (i.e. raw material), in applying the lower of cost or market principle, the net realizable value after considering estimated costs to convert those polysilicon into saleable finished goods is lower than market selling price (after deducting selling costs) of finish goods as of December 31, 2013 and 2014.
	Based on all the aforementioned factors, the Company concluded that no loss provision under the LTA with Supplier D should be provided as of December 31, 2013 and 2014. On March 31st, 2015, the Company received a termination notice from supplier D. (Refer to Note 26 Contingencies and Commitments)

Advances_to_suppliers

Advances to suppliers	12 Months Ended
	Dec. 31, 2014
Advances to suppliers
Advances to suppliers	8.Advances to suppliers
	In order to better manage the Group’s unit costs and to secure adequate and timely supply of polysilicon and silicon wafers during the periods of shortages of polysilicon and silicon wafer supplies, the Group entered into a number of multi-year supply agreements in amounts that were expected to meet the Group’s anticipated production needs. As a condition to the Group receiving the raw materials under those agreements, and in line with industry practice, the Group was required to, and had made advances for all, or a portion, of the total contract price to the Group’s suppliers, which are then offset against future purchases. Typically, the supply agreements are subject to price negotiations with the suppliers based on market prices. The Group has made advances to suppliers where the Group has committed to purchase minimum quantities under some of the supply agreements.
	Advances to suppliers to be offset against future purchases of which the Group expects to take delivery of the inventory after the next twelve months are classified as non-current assets in the Group’s Consolidated Balance Sheet as at year end dates.
	The Group does not require collateral or other security against its advances to related or third party suppliers. As a result, the Group’s claims for such prepayments would rank only as an unsecured claim, which exposes the Group to the credit risks of the suppliers. Also, the Group may not be able to recover all unutilized advances to suppliers if the Group does not purchase the minimum quantities or is unable to negotiate or renegotiate acceptable prepayment, quantities, prices and delivery terms with these suppliers, or unforeseen events impair the ability of suppliers to deliver raw materials, for example the recent earthquake in Japan.
	As of December 31, 2013 and 2014, outstanding prepayments, net of any allowance, made to individual suppliers in excess of 10% of total prepayments to suppliers are as follows:
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Supplier A (third party)	602,109		440,342
	Supplier B (third party)	174,278		134,035
	No other individual supplier has advance payment balances that accounted for more than 10% of the total balance as of December 31, 2014.
	The following table presents the movement of the allowance for advances to supplier:
		As of December		As of December		As of December
		31,		31,		31,
		2012		2013		2014
		RMB		RMB		RMB
	Balance at beginning of the year	94,154		158,452		72,327
	Allowance made during the year*	103,139		10,392		63,331
	Recoveries	(38,841	)	—		(6,351	)
	Written off	—		(96,517	)	—
	Balance at end of the year	158,452		72,327		129,307
	The Group continually assesses the credit quality of its suppliers and the factors that affect the credit risk. Given all circumstance and available evidence as of December 31, 2014, management assesses the risk that the Company is not able to fully utilize the remaining advance payment balance is remote and therefore no further provision was made against remaining advance payment balance as the balance was considered recoverable. Recoveries represent cash received or product delivered subsequently.
	* Although currently the Company is still in the process of renegotiating with Supplier D, such process has been slowed down due to uncertainties related to anti-dumping and anti-subsidy investigation and ruling. As of December 31, 2014, full provision of RMB 63,331 was provided against the prepayment made to Supplier D under the long-term supply contract, as management could not conclude that such amount is recoverable. On March 31st, 2015, the Company received a termination notice from supplier D. (Refer to Note 26 Contingencies and Commitments)

Other_current_assets

Other current assets	12 Months Ended
	Dec. 31, 2014
Other current assets
Other current assets	9.Other current assets
	Other current assets consisted of the following:
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Input value-added tax recoverable	330,482	434,209
	Income tax recoverable	47,819	—
	Value-added tax refund from export sales	31,670	150,911
	Prepaid input VAT & customs duty for import machinery and materials	14,226	21,700
	Prepaid expenses	12,311	12,184
	Foreign exchange forward contract instruments	237	5,540
	Accounts receivable recovery from insurance companies	15,059	—
	Deposit receivable	51,798	49,303
	Current portion of land use rights	10,063	10,063
	Others	22,469	29,853
		536,134	713,763

Property_plant_and_equipment_n

Property, plant and equipment, net	12 Months Ended
	Dec. 31, 2014
Property, plant and equipment, net
Property, plant and equipment, net	10.Property, plant and equipment, net
	Property, plant and equipment, net, consisted of the following:
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Buildings	1,255,743		1,482,046
	Furniture, fixtures and office equipment	83,745		92,175
	Motor vehicles	26,318		29,550
	Machinery and equipment	4,220,860		4,705,592
	Leasehold improvements	141,289		151,959
	Total	5,727,955		6,461,322
	Less: accumulated depreciation	(2,209,955	)	(2,759,096	)
	Subtotal	3,518,000		3,702,226
	Construction-in-progress	640,108		464,521
	Property, plant and equipment, net	4,158,108		4,166,747
	As of December 31, 2014, the Group pledged its buildings with the net book value of RMB 218,603 to secure a long-term bank borrowing of RMB 85,400 from Agricultural Bank of China. As of December 31, 2014, the Group pledged another building with the net book value of RMB 91,653 to secure a short-term bank borrowing of RMB 140,000 from Industrial Bank Co., Ltd. As of December 31, 2014, the Group pledged another buildings, machineries and equipment and construction in progress with the net book value of RMB 834,341 to secure a long-term entrusted loan of RMB 1,440,000 from Hefei High-Tech Industrial Development Zone Management Co., Ltd. As of December 31, 2014, the Group pledged the building with the net book value of RMB 116,192 to secure a short-term entrusted loan of RMB 39,980 from Shanghai Pudong Development Bank.
	For the years ended December 31, 2012, 2013 and 2014, total interest capitalized was RMB 51,783, RMB 39,902 and RMB 38,053, respectively.
	Depreciation expense was RMB 646,955, RMB 580,157 and RMB 672,855 for the years ended December 31, 2012, 2013 and 2014, respectively, and is recorded in manufacturing overhead, selling, general and administrative expenses, research and development expenses.
	The Group evaluates long-lived assets for impairment if events or changes in circumstances indicated that the carrying value of such assets may not be recoverable. Considering a rapid and continued decrease in selling price of multi-crystalline wafers and inadequate utilization of machines, the Group determined a two step impairment analysis is required in the year ended December 31, 2012. In step one impairment analysis, the estimated future undiscounted net cash flows expected to be generated by the assets over their remaining estimated useful lives were based on certain assumptions, such as forecasts of future operating results, gross margin and expected future growth rates. The estimated undiscounted future cash flows generated by the equipment used to produce multi-crystalline wafers were less than their carrying value, which required the step two impairment test. In the step two impairment analysis, the Group estimated the fair value based on discounted cash flow analysis using market participants’ assumptions, such as forecasts of future operating results, discount rates commensurate with the risk involved, and expected future growth rates. The carrying value of the equipment was reduced to fair value based on the discounted cash flow analysis. This resulted in a pre-tax charge of RMB 250,697 recorded in the impairment loss on property, plant and equipment in the Consolidated Statements of Operations and Comprehensive Loss in 2012. No impairment loss occurred in the year ended December 31, 2013 and 2014. Although assumptions used in estimates of future cash flows are management best estimates, such assumptions are, by nature, highly judgmental and may vary significantly from actual results.
	Additionally, in the year ended December 31, 2012, the Group recorded long-lived asset impairment of RMB 147,092 related to the retirement of each 300MW outdated solar cells and solar modules facilities at JA Hebei and JA Fengxian facilities, respectively. No impairment loss related to retirement of long-lived assets occurred in the years ended December 31, 2013 and 2014.

Intangible_assets_net

Intangible assets, net	12 Months Ended
	Dec. 31, 2014
Intangible assets, net
Intangible assets, net	11.Intangible assets, net
	Intangible assets, net, consisted of the following:
		Gross	Accumulated		Net
			Amortization
		RMB	RMB		RMB
	As of December 31, 2013
	Technical know-how	9,000	(9,000	)	—
	Customer relationship	3,191	(1,329	)	1,862
	Purchased software and others	23,941	(11,380	)	12,561
		36,132	(21,709	)	14,423
	As of December 31, 2014
	Technical know-how	9,000	(9,000	)	—
	Customer relationship	3,191	(1,968	)	1,223
	Purchased software and others	24,673	(13,168	)	11,505
		36,864	(24,136	)	12,728
	Amortization expense was RMB 4,572, RMB 3,018 and RMB 2,427 for the years ended December 31, 2012, 2013 and 2014, respectively, and is recorded in manufacturing overhead, selling, general and administrative expenses, research and development expenses.
	Amortization expense of the existing technical know-how, customer relationship and purchased software for each of the next five years will be approximately RMB 2,046.

Income_taxes

Income taxes	12 Months Ended
	Dec. 31, 2014
Income taxes
Income taxes	12.Income taxes
	Cayman Islands and British virgin Islands
	The Company is a tax exempt company incorporated in the Cayman Islands. Under the laws of Cayman Islands, the Company is not subject to tax on income or capital gain. The Company’s subsidiary established in the British Virgin Islands is tax exempt under the laws of British Virgin Islands, and accordingly, is not subject to tax on income or capital gain.
	People’s Republic of China
	Pursuant to PRC Foreign Enterprise Income Tax (“FEIT”) Law, foreign-invested enterprise (“FIEs”) are subject to FEIT at a state tax rate of 30% plus a local tax rate of 3% on PRC taxable income. FIEs are also entitled to be exempted from FEIT for a 2-year period starting from their first profit-making year followed by a 50% reduction of FEIT payable for the subsequent three years (“2+3 holiday”), if they fall into the category of production-oriented enterprises with an operational period of more than 10 years in China.
	On March 16, 2007, the National People’s Congress of China enacted a new Corporate Income Tax (“CIT”) Law, under which FIEs and domestic companies would be subject to CIT at a uniform rate of 25%. The new CIT Law has become effective on January 1, 2008. The grandfathering treatments for unutilized tax holiday are provided for certain qualified FIEs. For those FIEs which have already commenced their qualified tax holidays before 2008, they can continue to enjoy the remaining unutilized tax holidays until expiry. For those qualified old FIEs which have not commenced their tax holidays before 2008 due to cumulative losses, their tax holidays will be deemed to commence in 2008 and can be utilized until expiry.
	JA Hebei, JA Fengxian, JA Zhabei and JA Yangzhou were established before the effective date of the new CIT Law and subject to FEIT Law before January 1, 2008.
	Pursuant to the FEIT, JA Hebei received approval to enjoy a 2-year corporate income tax exemption for 2006 and 2007, as well as a 50% corporate income tax reduction from 2008 to 2010. After the new Corporate Income Tax law became effective on January 1, 2008, JA Hebei was entitled to enjoy grandfathering treatments for the unutilized tax holiday until expiration. The Company believes that the income generated by assets newly acquired by JA Hebei through a capital injection made in 2008 were also subject to the above mentioned grandfathered tax holiday and has been in compliance with the tax filing requirements.
	JA Fengxian and JA Yangzhou all had cumulative losses as of December 31, 2008 and their tax holidays were deemed to commence in 2008 and can be utilized until expiry pursuant to the new CIT Law.
	JA Zhabei, which is not a production-oriented enterprise, not entitled to the tax holiday.
	JA Lianyungang, which was established in 2008, JA Yangzhou R&D and JA Yangzhou PV, which were established in 2009, JA Wafer R&D and JA Jinglong, which were established/acquired in 2010, JA Hefei Renewable Energy, JA Hefei Technology and JA Investment, which were established in 2011, Solar Silicon Valley, which was acquired in 2011, are not entitled to the tax holiday.
	In accordance with the new CIT Law, a company is entitled to a preferential income tax of 15% if qualifying as an Advanced and New Technology Enterprise (“ANTE”). The preferential tax rate, once being approved by the relevant government authorities, is subject to renewal every three years. However, a company that enjoys the preferential income tax rate should perform self-assessment to ensure it maintains the required qualification during those three years. In November 2010, JA Hebei was recognized as an ANTE under the CIT Law and is entitled to the preferential income tax of 15% from 2010 to 2012. In March 2014, JA Hebei was again recognized as an ANTE under the new CIT Law and is entitled to the preferential income tax of 15% from 2013 to 2015. In August 2011, JA Yangzhou was recognized by the Chinese government as an ANTE and is entitled to the preferential income tax of 15% from 2011 to 2013. JA Yangzhou has chosen to complete the above mentioned 2+3 holiday for the overlapping period of 2011 and 2012. In August 2014, JA Yangzhou was again recognized as an ANTE under the new CIT Law and is entitled to the preferential income tax of 15% from 2014 to 2016. In November 2011, JA Lianyungang was recognized by the Chinese government as an ANTE and is entitled to the preferential income tax of 15% from 2011 to 2013. In October 2014, JA Lianyungang was again recognized as an ANTE under the new CIT Law and is entitled to the preferential income tax of 15% from 2014 to 2016.JA Fengxian was recognized as an ANTE and is entitled to the preferential income tax of 15% from 2011 to 2013. JA Fengxian has chosen to complete the above mentioned 2+3 holiday for the overlapping period of 2011 and 2012. In September 2014, JA Fengxian was again recognized as an ANTE under the new CIT Law and is entitled to the preferential income tax of 15% from 2014 to 2016. JA Wafer R&D was recognized by the Chinese government as an ANTE and is entitled to the preferential income tax of 15% from 2012 to 2014.
	On February 22, 2008, the Ministry of Finance (“MOF”) and the State Administration of Taxation (“SAT”) jointly issued Cai Shui [2008] Circular 1 (“Circular 1”). According to Article 4 of Circular 1, distributions of accumulated profits earned by a FIE prior to January 1, 2008 to foreign investor(s) in 2008 or after will be exempt from withholding tax (“WHT”) while distribution of the profit earned by an FIE after January 1, 2008 to its foreign investor(s) shall be subject to WHT at a rate up to 10% (lower rate is available under the protection of tax treaties). As a result, if any dividends are declared out of the cumulative retained earnings as of December 31, 2007, they should be exempt from WHT. In 2012, JA Hebei declared dividends of RMB 107,804 out of the cumulative retained earnings as of December 31, 2007 to JA BVI, which is exempt for WHT. JA Yangzhou, as requested by the local tax bureau, declared dividends of RMB 210,637 out of the earnings after January 1, 2008 to JA BVI in order to meet the capital injection requirement for JA Yangzhou. Pursuit to Circular 1, the appropriation of dividend for reinvestment purpose is subject to 10% WHT, amounting to RMB 21,064, which was paid and recorded as income tax expenses for the year ended December 31, 2012. Excluding JA Yangzhou’s dividend appropriation requested by the local tax bureau, the Group intends to indefinitely reinvest its earnings to further expand its businesses in mainland China, its foreign invested enterprises do not intend to declare dividends to their immediate foreign holding companies in the foreseeable future. Undistributed earnings as of December 31, 2013 and 2014 are considered to be indefinitely reinvested, and therefore, no deferred tax liability was recognized. Cumulative undistributed earnings of the Company’s PRC subsidiaries intended to be permanently reinvested totaled RMB 2,478,536 and RMB 3,092,616 and the amount of the unrecognized deferred tax liability on the permanently reinvested earnings was RMB 247,854 and RMB 309,262 as of December 31, 2013 and 2014.
	Hong Kong SAR
	No income tax provision has been made for JA Hong Kong and JA International in any period, as the entities did not have assessable profits subject to Hong Kong Profit Tax at the rate of 16.5% for the years presented.
	United States
	JA USA is subject to US federal statutory tax rate of 35% and also subject to the state of California income tax rate of 8.84%. The state income tax paid is deductible for US federal income tax.
	European Countries
	JA Lux is incorporated in Luxemburg and is subject to a 29.22% corporate tax rate.
	JA GmbH is incorporated in Germany and is subject to effective income tax rate of 29.55% which consists of 15% corporate income tax plus a solidarity surcharge of 5.5% on corporate income tax and a trade income tax rate of 13.72%.
	Japan
	JA Japan is subject to Japanese corporate income tax rate of 35.64%.
	Australia
	JA Australia is subject to Australia corporate income tax rate of 30%.
	The tax benefit/(expense) comprises:
			For the year		For the year		For the year
			ended		ended		ended
			December 31,		December 31,		December 31,
			2012		2013		2014
	Current tax		(101,975	)	(13,462	)	(189,622	)
	Deferred tax		1,350		28,489		116,232
			(100,625	)	15,027		(73,390	)
	Components of deferred tax assets consisted of the following:
			As of December		As of December
			31,		31,
			2013		2014
			RMB		RMB
	Deferred tax assets:
	Temporary differences:
	Pre-operating expenses		92		—
	Amortization of intangible assets		1,232		1,135
	Accrued warranty costs		28,510		49,309
	Accrued expenses		23,746		25,438
	Net loss carried forward		395,477		229,859
	Depreciation of property, plant and equipment		86,997		103,758
	Inventory write-down and idle capacity charges		13,322		9,813
	Allowance for doubtful accounts		69,199		66,991
	Allowance for advance to suppliers		10,397		18,665
	Impairment loss on property, plant and equipment		156,483		103,195
	Loss for equity investment in a joint venture		4,967		—
	Accrued interest		13,209		27,279
	Government grant for the acquisition of land use rights and property, plant and equipment		8,379		44,057
	Timing difference for revenue recognition of retainage contract		21,726		32,746
	Others		4,047		18,704
	Deferred tax assets		837,783		730,949
	Deferred tax liabilities:
	Temporary differences:
	Capitalized interest		(31,983	)	(35,333	)
	Deferred tax liabilities		(31,983	)	(35,333	)
	Less: valuation allowance		(683,341	)	(456,925	)
	Deferred tax assets-net		122,459		238,691
	Deferred tax assets are analyzed as:
			As of December		As of December
			31,		31,
		2013		2014
		RMB		RMB
Current		64,409		90,169
Non-Current		90,033		183,855
		154,442		274,024
Deferred tax liability are analyzed as:
Current		—		—
Non-Current		-31,983		(35,333	)
		-31,983		(35,333	)
		122,459		238,691
The following table presents the movement of the valuation allowance for deferred tax assets:
		As of December		As of December 31,		As of December
		31,				31,
		2012		2013		2014
		RMB		RMB		RMB
Balance at beginning of the year		202,235		576,541		683,341
Business combination		—		63,873		—
Allowance made during the year		374,306		158,904		40,619
Reversals and utilization		—		(115,977	)	(267,035	)
Balance at end of the year		576,541		683,341		456,925
The Group has made some portion of valuation allowance against its net deferred tax assets. The Group evaluates a variety of factors in determining the amount of the valuation allowance, including its earnings history, the tax holiday period, the existence of taxable temporary differences, and near-term earnings expectations. Future reversal of the valuation allowance will be recognized upon the earlier of when the benefit is realized or when it has been determined that it is more likely than not that the benefit will be realized through future earnings. Certain valuation allowance was reversed and utilized in 2013 and 2014 when certain subsidiaries generated sufficient taxable income to utilize the deferred tax assets in the current year. Furthermore, a portion of valuation allowance was reversed in 2013 and 2014 due to the expected utilization of deferred tax assets in the future.
Reconciliation between the provision for income tax computed by applying the statutory CIT and the Group’s effective tax rate:
		For the year		For the year		For the year
		ended		ended		ended
		December 31,		December 31,		December 31,
		2012		2013		2014
PRC enterprise income tax		(25	)%	(25	)%	25	%
Effect of permanent differences:
Share based compensation and other permanent difference		5.62	%	4.03	%	4.50	%
Effect of tax holiday and tax differential of certain subsidiaries (1)		(2.10	)%	8.17	%	(8.43	)%
Effect of tax rate change (2)		(2.69	)%	(0.32	)%	24.30	%
Additional tax for previously approved tax holiday		5.29	%	—	%	—	%
Withholding tax for dividend distribution		1.35	%	—	%	—	%
Intra-group investment disposal income subject to tax		—		—		12.28	%
Valuation allowance		23.97	%	9.72	%	(43.54	)%
		6.44	%	(3.40	)%	14.11	%
	-1		Effect of tax holiday and tax differential of certain subsidiaries increased from 8.17% to 8.43%, mainly due to fair value gain generated in 2014 by JA Cayman related to warrants, which are not subject to tax on income or capital gain.
	-2		Change of tax rate increased from (0.32%) in 2013 to 24.30% in 2014 is due to the different enacted tax rate used in the calculation of deferred tax assets in 2014 for one subsidiary to reflect the decrease of tax rate, which resulted in the reduction of previously disclosed deferred tax asset benefit (gross amount). Deferred tax assets for this subsidiary have been fully provided for valuation allowance in both 2014 and 2013. The corresponding reversal of valuation allowance has been included in the line of valuation allowance.
Aggregate amount and per share effect of the tax holiday are as follows:
		For the year		For the year		For the year
		ended		ended		ended
		December 31,		December 31,		December 31,
		2012		2013		2014
The aggregate dollar effect		—		10,540		43,405
Per share effect-basic		—		0.05		0.18
Per share effect-diluted		—		0.05		0.18

Government_grant

Government grant	12 Months Ended
	Dec. 31, 2014
Government grant
Government grant	13.Government grant
	Government grants are recognized where there is reasonable assurance that the grant will be received and all attached conditions will be complied with.
	Grant relating to cash subsidies received by the Group’s entity in the PRC from various level of government authorities. The government subsidies are granted from time to time at the discretion of the relevant government authorities. Cash subsidies have no defined rules and regulations to govern the criteria necessary for companies to enjoy the benefits and are recognized as other income when received and when all conditions for their receipt have been satisfied.
	Grants for the acquisition of land use right and property, plant and equipment are recorded as long-term liabilities and amortized to other income over the amortization period, which represents the depreciable life of the related PP&E. Government grants received related to property, plant and equipment are classified as investing cash inflows on the Group’s consolidated cash flow statements. Government grants received related to land use right are classified as operating cash inflows on the Group’s consolidated cash flow statements just as company expenditures for land use rights are classified as operating cash outflows. The Group received government grant related to property, plant and equipment and land use rights of RMB 78,020, RMB 126,900 and RMB 45,300 during the years ended December 31, 2012, 2013 and 2014, respectively. As of December 31, 2013 and 2014, long-term liability balance of RMB 262,348 and RMB 278,272 was related to government grant for the acquisition of land use rights and property, plant and equipment, respectively.
	The Group recorded RMB 18,672, RMB 14,471 and RMB 32,078 as other income for the years ended December 31, 2012, 2013 and 2014, respectively, among which RMB 9,002, RMB 13,290, and RMB 27,376 are related to the amortization of government grant.

Prepaid_land_use_rights

Prepaid land use rights	12 Months Ended
	Dec. 31, 2014
Prepaid land use rights
Prepaid land use rights	14.Prepaid land use rights
	The prepaid land use rights of the Group represented prepaid operating lease payments in obtaining land use rights in the PRC for a period of 40 or 50 years.
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Cost	491,638		491,638
	Less: accumulated amortization	(32,956	)	(43,019	)
	Net book value	458,682		448,619
	Current portion of prepaid land use rights (recorded in other current assets)	10,063		10,063
	Non-current portion of prepaid land use rights	448,619		438,556
	Total	458,682		448,619
	As of December 31, 2014, the Group pledged its land use right with the net book value of RMB 74,211 to secure a long-term bank borrowing of RMB 28,600 from Agricultural Bank of China. As of December 31, 2014, the Group pledged another land use right with the net book value of RMB 213,840 to secure a long-term entrusted loan of RMB 1,440,000 from Hefei High-Tech Industrial Development Zone Management Co., Ltd. As of December 31, 2014, the Group pledged the land use right with the net book value of RMB 26,086 to secure a short-term entrusted loan of RMB 39,980 from Shanghai Pudong Development Bank.

Borrowings

Borrowings (Loans Payable)	12 Months Ended
	Dec. 31, 2014
Loans Payable
Borrowings
Borrowings	15. Borrowings
	Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
				RMB)
	As of December 31, 2013
	Short-term loan:
	Bank of China	September 2013	September 2014	200,000	Quarterly
	Agriculture Bank of China	September 2013	September 2014	80,000	Monthly
	Agriculture Bank of China	September 2013	January 2014	34,379	Together with principal
	Agriculture Bank of China	September 2013	February 2014	79,248	Together with principal
	Agriculture Bank of China	November 2013	April 2014	539	Together with principal
	Agriculture Bank of China	December 2013	May 2014	3,073	Together with principal
	Agriculture Bank of China	December 2013	April 2014	95,721	Monthly
	Agriculture Bank of China	December 2013	May 2014	2,038	Together with principal
	Agriculture Bank of China	December 2013	May 2014	1,996	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	December 2013	June 2014	30,000	Together with principal
	Huaxia Bank	May 2013	February 2014	40,000	Together with principal
	Huaxia Bank	February 2013	February 2014	10,000	Together with principal
	Bank of Communication	August 2013	February 2014	42,000	Monthly
	Hefei S & T Rural Commercial Bank	March 2013	March 2014	150,000	Quarterly
	Hefei S & T Rural Commercial Bank	April 2013	March 2014	50,000	Quarterly
	Rural Credit Cooperative of Hebei	March 2013	March 2014	28,000	Monthly
	Bank of Xingtai	June 2013	June 2014	20,000	Monthly
	Bank of Xingtai	July 2013	June 2014	40,000	Monthly
	OCBC Bank	March 2013	April 2014	30,485	Monthly
	OCBC Bank	May 2013	May 2014	54,873	Monthly
	Other loan *	April 2013	March 2014	30,000	Quarterly
	Other loan*	November 2013	November 2014	50,000	Quarterly
	Subtotal			1,122,352
	*Local government provided short-term loan to one subsidiary located in Jiangsu Province with market interest rate bearing.
	Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment
				RMB)	Periods
	Long-term loan due in one year:
	China Construction Bank	May 2012	April 2014	157,000	Monthly
	China Construction Bank	June 2012	May 2014	34,000	Monthly
	Industrial and Commercial Bank of China	December 2011	November 2014	150,000	Monthly
	Bank of Xingtai	September 2012	September 2014	100,000	Monthly
	Industrial and Commercial Bank of China	March 2011	March 2014	140,000	Monthly
	Industrial and Commercial Bank of China	April 2011	March 2014	40,000	Monthly
	Industrial and Commercial Bank of China	May 2011	March 2014	20,000	Monthly
	Industrial and Commercial Bank of China	June 2011	June 2014	15,917	Monthly
	Industrial and Commercial Bank of China	December 2011	June 2014	57,246	Monthly
	China Everbright Bank	June 2011	June 2014	200,000	Quarterly
	Agriculture Bank of China	August 2012	February 2014	2,850	Quarterly
	Agriculture Bank of China	September 2012	February 2014	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2014	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2014	8,150	Quarterly
	Subtotal			936,163
	Short-term borrowings and current portion of long term borrowings			2,058,515
	Long-term loan:
	Industrial and Commercial Bank of China	June 2011	January 2019	720,000	Annually
	Industrial and Commercial Bank of China	June 2011	January 2018	432,000	Annually
	Industrial and Commercial Bank of China	June 2011	January 2017	288,000	Annually
	Agriculture Bank of China	September 2012	February 2015	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2015	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2015	8,150	Quarterly
	Agriculture Bank of China	August 2012	February 2016	2,850	Quarterly
	Agriculture Bank of China	September 2012	February 2016	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2016	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2016	8,150	Quarterly
Agriculture Bank of China	August 2012	February 2015	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2017	2,850	Quarterly
Agriculture Bank of China	September 2012	February 2017	8,150	Quarterly
Agriculture Bank of China	August 2012	August 2017	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2017	8,150	Quarterly
Agriculture Bank of China	August 2012	February 2018	2,850	Quarterly
Agriculture Bank of China	September 2012	February 2018	8,150	Quarterly
Agriculture Bank of China	August 2012	August 2018	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2019	10,100	Quarterly
Agriculture Bank of China	August 2012	February 2019	2,900	Quarterly
Agriculture Bank of China	August 2012	August 2019	2,900	Quarterly
Agriculture Bank of China	September 2012	August 2019	10,100	Quarterly
Subtotal			1,554,000
Total borrowings			3,612,515
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of December 31, 2014
Short-term loan:
Industrial and Commercial Bank of China	April 2014	March 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	October 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	June 2015	50,000	Monthly
Industrial and Commercial Bank of China	May 2014	April 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	June 2015	58,131	Monthly
Bank of Communication	January 2014	January 2015	50,000	Monthly
Bank of Communication	August 2014	February 2015	97,904	Together with principal
Huaxia Bank	March 2014	March 2015	30,000	Monthly
Huaxia Bank	April 2014	April 2015	20,000	Monthly
Huaxia Bank	May 2014	March 2015	30,000	Monthly
China Merchant Bank	October 2014	April 2015	62,000	Together with principal
China Merchant Bank	November 2014	May 2015	28,759	Together with principal
China Merchant Bank	September 2014	March 2015	48,952	Together with principal
China Merchant Bank	December 2014	June 2015	30,000	Together with principal
China Merchant Bank	December 2014	June 2015	32,400	Together with principal
China Construction Bank	April 2014	April 2015	48,500	Monthly
China Construction Bank	April 2014	April 2015	100,000	Monthly
China Construction Bank	April 2014	April 2015	11,500	Monthly
China Construction Bank	May 2014	May 2015	34,000	Monthly
China Construction Bank	November 2014	May 2015	48,789	Monthly
China Construction Bank	November 2014	May 2015	22,171	Monthly
Bank of China	June 2014	June 2015	200,000	Quarterly
Bank of China	September 2014	March 2015	34,849	Monthly
Bank of China	October 2014	April 2015	35,490	Monthly
Industrial and Commercial Bank of China	December 2014	November 2015	150,000	Monthly
Agriculture Bank of China	May 2014	May 2015	20,000	Monthly
Agriculture Bank of China	March 2014	March 2015	76,363	Monthly
Agriculture Bank of China	January 2014	January 2015	50,000	Monthly
Agriculture Bank of China	February 2014	February 2015	30,000	Monthly
Agriculture Bank of China	August 2014	January 2015	3,139	Together with principal
Agriculture Bank of China	August 2014	February 2015	66,746	Together with principal
Agriculture Bank of China	August 2014	January 2015	3,625	Together with principal
Agriculture Bank of China	August 2014	February 2015	38,418	Together with principal
Agriculture Bank of China	August 2014	January 2015	2,889	Together with principal
Agriculture Bank of China	September 2014	January 2015	3,429	Together with principal
Agriculture Bank of China	September 2014	March 2015	12,116	Together with principal
Agriculture Bank of China	September 2014	February 2015	3,483	Together with principal
Agriculture Bank of China	September 2014	March 2015	14,935	Together with principal
Agriculture Bank of China	September 2014	February 2015	74,040	Together with principal
Agriculture Bank of China	September 2014	February 2015	3,299	Together with principal
Agriculture Bank of China	October 2014	March 2015	2,288	Together with principal
Agriculture Bank of China	October 2014	March 2015	1,212	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,966	Together with principal
Agriculture Bank of China	October 2014	March 2015	2,472	Together with principal
Agriculture Bank of China	October 2014	March 2015	3,209	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,439	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,955	Together with principal
Agriculture Bank of China	December 2014	April 2015	2,956	Together with principal
Agriculture Bank of China	December 2014	May 2015	1,457	Together with principal
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of December 31, 2014
Short-term loan(continued):
Agriculture Bank of China	December 2014	May 2015	2,988	Together with principal
Agriculture Bank of China	December 2014	May 2015	2,084	Together with principal
Bank of Xingtai	September 2014	September 2015	2,000	Monthly
Bank of Xingtai	September 2014	March 2015	1,000	Monthly
Industrial Bank Co., Ltd.	April 2014	April 2015	140,000	Quarterly
Bank of Xingtai	June 2014	June 2015	60,000	Monthly
Hefei S & T Rural Commercial Bank	June 2014	May 2015	100,000	Quarterly
Hefei S & T Rural Commercial Bank	June 2014	May 2015	100,000	Quarterly
Rural Credit Cooperative of Hebei	March 2014	March 2015	28,000	Monthly
Bank of Xingtai	September 2014	March 2015	100	Monthly
Bank of Xingtai	September 2014	September 2015	200	Monthly
Bank of Xingtai	September 2014	March 2015	100	Monthly
Bank of Xingtai	September 2014	September 2015	200	Monthly
Shanghai Pudong Development Bank	August 2014	August 2015	39,980	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2015	2,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2015	2,000	Quarterly
Subtotal			2,275,533
Long-term loan due in one year:
Agriculture Bank of China	August 2012	February 2015	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2015	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2015	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2015	8,150	Quarterly
Subtotal			22,000
Short-term borrowings and current portion of long term borrowings			2,297,533
Long-term loan:
Agriculture Bank of China	June 2014	June 2016	80,000	Monthly
Bank of Xingtai	September 2014	September 2016	74,000	Monthly
Bank of Xingtai	September 2014	March 2016	3,000	Monthly
Bank of Xingtai	September 2014	March 2016	300	Monthly
Bank of Xingtai	September 2014	September 2016	8,400	Monthly
Bank of Xingtai	September 2014	March 2016	300	Monthly
Bank of Xingtai	September 2014	September 2016	8,400	Monthly
Industrial and Commercial Bank of China	July 2014	January 2017	288,000	Annually
Industrial and Commercial Bank of China	July 2014	January 2018	300,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	168,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	300,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2018	132,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	252,000	Annually
Industrial and Commercial Bank of China	December 2014	May 2016	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2016	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2017	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2017	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2018	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2018	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2019	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2019	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2020	7,000	Quarterly
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of Decemberember 31, 2014
Long term loan(continued):
Industrial and Commercial Bank of China	December 2014	November 2020	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2021	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2021	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2022	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2022	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2023	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2023	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2024	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2024	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2025	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2025	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2026	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2026	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2027	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2027	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2028	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2028	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2029	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	December 2029	7,000	Quarterly
Agriculture Bank of China	August 2012	February 2017	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2018	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2019	2,900	Quarterly
Agriculture Bank of China	August 2012	February 2016	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2016	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2017	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2018	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2019	2,900	Quarterly
Agriculture Bank of China	September 2012	February 2016	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2016	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2017	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2017	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2019	10,100	Quarterly
Agriculture Bank of China	September 2012	August 2019	10,100	Quarterly
Subtotal			1,902,400
Total borrowings			4,199,933
	As of December	As of December
	31,	31,
	2013	2014
	RMB	RMB
Short-term	1,122,352	2,275,533
Long-term, current portion	936,163	22,000
Subtotal	2,058,515	2,297,533
Long-term	1,554,000	1,902,400
Total	3,612,515	4,199,933
These loans are borrowed from various financial and non-financial institutions and all of them are for working capital and capital expenditure purpose. The borrowings outstanding as of December 31, 2013 and 2014 bore a weighted average interest rate of 6.42% and 6.07% per annum, respectively. The interest rates of unsecured short-term bank borrowings with principal amounts of RMB 956,994 and RMB 2,090,953 as of December 31, 2013 and 2014, respectively, ranged from 2.67% to 7.80% with a weighted average interest rate of 6.04% for 2013 and from 1.35% to 7.82% with a weighted average interest rate of 5.66% for 2014. The interest rate of short-term bank borrowings secured by restricted cash with principal amounts of RMB 85,358 and RMB 600 as of December 31, 2013 and 2014, respectively, ranged from 1.66% to 1.67% with a weighted average interest rate of 1.67% for 2013 and at the interest rate of 6.15% for 2014. The interest rate of short-term bank borrowings secured by land use right, buildings and project assets with principal amount of RMB 183,980 as of December 31, 2014, ranged from 6.15% to 6.90% with a weighted average interest rate of 6.53% for 2014. There was no short-term borrowing secured by land use right, buildings and project assets for 2013. There was no short-term borrowing from the non-financial institution as of December 31, 2014. The interest rate of short-term borrowing from one non-financial institution with principal amount of RMB 80,000 as of December 31, 2013 was 9.0%. The interest rate of unsecured long-term bank borrowings with principal amounts of RMB 914,163 and RMB 157,000 as of December 31, 2013 and 2014, respectively, ranged from 6.15% to 7.07% with a weighted average interest rate of 6.48% for 2013 and from 6.52% to 6.77% with a weighted average interest rate of 6.64% for 2014. The interest rate of long-term bank borrowings secured by buildings, machineries and equipment, construction in progress and project assets with principal amount of RMB 1,576,000 and RMB 1,767,400 as of December 31, 2013 and 2014, respectively, ranged from 6.72% to 7.01% with a weighted average interest rate of 6.74% for 2013 and from 6.15% to 7.01% with a weighted average interest rate of 6.46% for 2014. The borrowings have 5-month to 179-month terms and expire at various times. The unused lines of credit were RMB 690,710, which were available as of December 31, 2014. Among the unused lines of credit, RMB 100,000 was secured by project assets.
Interest incurred for borrowings for the years ended December 31, 2012, 2013 and 2014 amounted to RMB 348,510, RMB 278,190 and RMB 267,718, respectively, of which RMB 45,059, RMB 37,495 and RMB 38,053 was capitalized in the cost of property, plant and equipment.
As of December 31, 2014, the borrowings of RMB 600 and RMB 17,400 for short-term and long-term respectively in Bank of Xingtai were secured by the restricted cash balance with amount of RMB 20,000 in JA Hebei. The short term entrusted loan of RMB 39,980 with Shanghai Pudong Development Bank was secured by the land use right with the net book value of RMB 26,086 and the buildings with the net book value of RMB 116,192. The short-term borrowings of RMB 140,000 in Industrial Bank Co., Ltd was secured by the building with the net book value of RMB 91,653. The long-term borrowings of RMB 85,400 and RMB 28,600 in Agricultural Bank of China were secured by the buildings with the net book value of RMB 218,603 and land use right with the net book value of RMB 74,211 in Shanghai Jinglong Solar Technology Co., Ltd., respectively. The borrowings of RMB 4,000 and RMB 196,000 for short-term and long-term respectively in Industrial and Commercial Bank of China were secured by the project assets with the net book value of RMB 310,029. In January 2014, the Group renewed a long-term entrusted loan of RMB 1,440,000 with Hefei High-Tech Industrial Development Zone Management Co., Ltd., which is secured by buildings, machineries and equipment and construction in progress with the net book value of RMB 834,341 and land use rights with net book value of RMB 213,840 owned by JA Hefei Technology and all of the equity interests in and JA Hefei Technology.
JA Solar and China Development Bank Shanghai Branch (“CDB”) entered into a financial partnership agreement in September 2010, pursuant to the agreement, CDB agrees to provide up to RMB 30 billion of credit facilities to JA Solar from 2010 to 2015 to support JA Solar’s capital needs under its long-term growth and corporate development plans. As a result of the Financial Partnership Agreement, the Company is qualified to have an expedited approval process for individual credit agreements. Detailed terms including interest rate and covenants of each such credit facility will be determined by CDB in accordance with its risk management and operational guidelines, and set forth in individual credit agreements between CDB and the Company. As of December 31, 2013 and 2014, the Group had drawn down RMB nil and RMB nil of the credit facility, respectively.
There are two subsidiaries whose borrowing agreements include the restrictive financial covenants. For JA Hebei, the borrowing of RMB 194,000 from China Construction Bank should meet the criteria: 1) the gearing ratio should be no more than 55%; 2) the current ratio should be no less than 1.6; 3) the quick ratio should be no less than 1.5; 4) the long-term investment should no more than 30% of net asset; 5) the external guarantee should be no more than 55% of net asset. For JA Yangzhou, the borrowing of RMB 80,000 from Huaxia Bank should meet the criteria: the gearing ratio should be no more than 70%. As of December 31, 2014, those two subsidiaries meet the criteria.
Future principal repayments on the long-term borrowings are as follows:
Year ending December 31,	RMB
2015	22,000
2016	210,400
2017	324,000
2018	468,000
Thereafter	900,000
Total	1,924,400

Senior_Convertible_Notes

Senior Convertible Notes (4.5% Senior Convertible Notes due 2013)	12 Months Ended
	Dec. 31, 2014
4.5% Senior Convertible Notes due 2013
Senior Convertible Notes
Senior Convertible Notes	16.Senior Convertible Notes
	On May 13, 2008, the Company entered into an underwriting agreement for the sale by the Company to the public of $350,000 aggregate principal amount of 4.5% Senior Convertible Notes due 2013 (the “Senior Notes”). The Company granted to the underwriters a 30-day option to purchase up to an additional $50,000 aggregate principal amount of Senior Notes. On May 19, 2008, the Company completed its public offering of $400,000 aggregate principal amount of its Senior Notes which includes the underwriter’s exercise of their option. Net proceeds to the Company from the offering were approximately RMB 2,709,538. The Company’s financing costs of RMB 80,010 associated with the Senior Notes are amortized through interest expense over the life of the Senior Notes from May 2008 to the first put date, or May 2013 using the effective interest rate method. The amount amortized to interest expense for the year ended December 31, 2012 and 2013 was RMB 9,656 and RMB 2,606, respectively. This change in the balance of deferred issuance cost includes the pro-rata reduction of deferred issuance cost that is a component of the extinguished gain from the Senior Notes bought back by the Group.
	The Senior Notes bear interest at the rate of 4.5% per annum, payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2008. The Senior Notes will mature on May 15, 2013 unless previously repurchased by the Company or converted in accordance with their terms prior to such date. On or after May 15, 2011, the Company has the option to redeem for cash all or part of the Senior Notes at principal if the closing sale price of the Company’s ADS exceeds 130% of the then effective conversion price for at least 20 trading days during the period of the 30 consecutive trading days ending on the last trading day on which notice of redemption is provided. If certain fundamental changes occur at any time prior to maturity, holders of the Senior Notes may require the Company to repurchase their Senior Notes in whole or in part for cash equal to 100% of the principal amount of the Senior Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the date of repurchase. The interest expense recognized for interest payable to the Senior Notes holders was RMB 56,893 and RMB 12,300 for the years ended December 31, 2012 and 2013 respectively.
	Each $1,000 principal amount of the Senior Notes will initially be convertible into 6.5628 American Depository Shares, or ADSs, par value $.0001 per share at a conversion price of $152.375, subject to adjustment. The Senior Notes are convertible at maturity and upon certain other events, including when the trading price of the Company’s ADS exceeds 130% of the then effective conversion price for at least 20 trading days during the period of the 30 consecutive trading days ending on the last trading day of the previous fiscal quarter.
	The Company used the proceeds from the issuance of the Senior Notes for the purchase and construction of manufacturing equipment and facilities, the purchase and prepayment of raw materials, working capital and other general corporate purposes.
	The Company’s functional currency is different from the denomination of the Senior Notes and the Company’s early redemption option is contingent upon its ADS price. Therefore, in accordance with ASC 815, Derivatives and Hedging, the Company accounted for the conversion feature, early redemption option and conversion rate adjustment feature (together, “Embedded Derivatives”) as a freestanding instrument separately in the balance sheet. The Senior Notes were recorded with a discount equal to the value of the Embedded Derivatives at the transaction date and will be accreted to the redemption value of the Senior Notes over the life of the Senior Notes. The change in fair value of the Embedded Derivatives of RMB 32 and RMB nil was recorded in Consolidated Statements of Operations and Comprehensive Loss for the years ended December 31, 2012 and 2013, respectively. This change in fair value excludes the pro-rata reduction of the Embedded Derivatives that are a component of the extinguishment gain from the Senior Notes bought back by the Group. The interest expense recognized for accretion to the redemption value of the Senior Notes was RMB 96,532 and RMB 24,216 for the years ended December 31, 2012 and 2013, respectively.
	During the years ended December 31, 2012 and 2013, the Company bought back US$ 105,427and US$ nil (par value) of the Senior Notes, respectively, at prices ranging from 72.48% to 95.35% of face value. The gain/(loss) from the Senior Notes buyback was RMB (8,466) and RMB nil respectively, for the years ended December 31, 2012 and 2013. In May 2013, the Company repaid the remaining principal amount of RMB 723,742 and accrued interest of the Senior Notes.
	ADS Lending Agreement
	Concurrent with the offering and sale of the Senior Notes on May 12, 2008, the Company entered into a share lending agreement (the “ADS Lending Agreement”) with certain financial institutions (the “ADS Borrower (s)”), pursuant to which the Company loaned 2,625,104 ADSs (the “Loaned ADSs”) to the ADS Borrowers. The ADS Borrowers will receive all of the proceeds from the sale of the borrowed ADSs. The Company will not receive any proceeds from the sale of the borrowed ADSs pursuant to the ADS Lending Agreement, but the Company will receive from the ADS Borrowers a nominal lending fee of $0.0005 per ADS for each ADS that the Company loaned pursuant to the ADS Lending Agreements.  The nominal lending fee is reported as increases to additional paid in capital. These Loaned ADSs must be returned to the Company no later than May 15, 2013, or sooner if certain conditions are met. In the event of default, the ADS Borrower is required to return the loaned shares to the Company. If unable to do so, at the Company’s request, the ADS Borrower shall pay cash equal to the market value of unreturned shares. The purpose of the share lending arrangement was to facilitate the investors of the Senior Convertible Notes to hedge the conversion option in such Notes.
	These shares were considered issued and outstanding for corporate law purposes at the time they were loaned; however, at the time of the loan they were not considered outstanding for the purpose of computing and reporting earnings per share because these shares were to be returned to the Company no later than May 15, 2013, the maturity date of the Senior Notes. On September 15, 2008, one of the ADS borrowers, who the Company had loaned 1,312,552 ADSs, filed for protection under Chapter 11 of the federal Bankruptcy Code and was placed into administration proceeding in the United Kingdom.
	As a result of the bankruptcy filing and the administration proceeding, the ADS Lending Agreement automatically terminated and the ADS Borrower was contractually required to return the Loaned ADSs to the Company. The Company has since demanded the immediate return of all outstanding borrowed shares, however, the shares have not yet been returned. Also under the agreement, the ADS borrower was supposed to transfer collateral to an affiliate equal to the fair value of the shares loaned after it received a credit downgrade on September 15, 2008. Such collateral was to be held in a collateral account for the Company. No collateral transfer was made and the Company is not aware of any collateral account existing. While the Company believes it is exercising all of its legal remedies, it has included these shares in its per share calculation on a weighted average basis due to the uncertainty regarding the recovery of the borrowed shares.
	The Company accounts for the share lending arrangement in accordance with ASU 2009-15, Accounting for Own-Share Lending Arrangements in Contemplation of Convertible Debt Issuance or Other Financing, which requires an entity that enters into an equity-classified share lending agreement, utilizing its own shares, in contemplation of a convertible debt issuance or other financing to initially measure the share lending arrangement at fair value and treat it as a cost of the financing. The Company estimated that the fair value of the share lending arrangement at issuance was RMB 230,729, which was recognized as an issuance cost of the Senior Convertible Notes, with an offset to additional paid-in capital. Issuance costs were deferred on the balance sheet and amortized over the life of the Senior Convertible Notes. In the year ended December 31, 2008, due to the bankruptcy of one of the ADS borrowers, the Company assessed it became probable that the borrower would default. As result, the Company recognized an expense of RMB 469,042, which equaled to the then fair value of the 1,312,552 ADSs lent to the borrower, net of the fair value of probable recoveries, with an offset to additional paid-in capital. Probable recoveries were estimated as nil at the time in 2008. The fair value of the outstanding loaned shares was RMB 35,230 (US$ 5,605) as of December 31, 2012. The unamortized amount of the issuance costs associated with the share-lending arrangement included in the deferred issuance cost in the balance sheet were RMB 8,253 as of December 31, 2012. The amount of interest cost recognized relating to the amortization of the issuance cost associated with the share-lending arrangement were RMB 29,537 and RMB 8,208 for the years ended December 31, 2012 and 2013, respectively.
	In June 2012, a Claims Determination Deed was entered into between the Company and One ADS Borrower (the “Claims Determination Deed”), admitting the Claim (the “Claim”) against the Borrower as a general unsecured claim which qualifies for dividends from the Borrower for an amount of GBP 38.2 million (RMB 380,075). On June 29, 2012, the Company entered into an agreement through private negotiation with a carefully selected group of claims purchasers to sell certain rights pertaining to the claim against the Borrower and all rights to receive distribution payments from the Borrower in exchange for cash consideration of GBP 37.1 million (RMB 369,153). As required under the claim transfer procedures, the joint administrators of the Borrower have acknowledged the sale of the Claim to the purchaser on August 9, 2012. There is no recourse from the purchaser to the Company if the claim is not satisfied in full by the Borrower. A gain of RMB 369,153 was recorded as other income in the Consolidated Statements of Operations and Comprehensive Loss.
	After the Company repaid the principal amount and accrued interest of the Senior Notes, the other ADS Borrower returned the Loaned ADS to the Company in full in May 2013.

Other_payables_to_third_partie

Other payables to third parties	12 Months Ended
	Dec. 31, 2014
Other payables to third parties
Other payables to third parties	17.Other payables to third parties
	Other payables consisted of the following:
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Payables for purchase of property, plant and equipment	221,232	195,069
	Payables for project assets	—	134,667
	Payables for land use rights	35,000	33,000
	Miscellaneous tax payables	18,253	34,033
	Deposits	5,433	21,679
	Labor services payables	11,959	8,634
	Logistic charges	28,422	48,132
	Payable to staff *	52,732	—
	Interest	88,060	181,857
	Others	21,179	36,300
	Total other payables	482,270	693,371
	*Amount due to employees related to short term borrowings from employees at an average interest rate of 9%.

Accrued_expenses

Accrued expenses	12 Months Ended
	Dec. 31, 2014
Accrued expenses
Accrued expenses	18.Accrued expenses
	Accrued expenses consisted of the following:
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Professional service fees	10,659	19,885
	Interest	107,611	47,250
	Utilities	2,685	2,109
	Logistic charges	11,153	23,738
	Tax	12,740	16,159
	Others	21,206	38,153
	Total accrued expenses	166,054	147,294

Accrued_warranty_cost

Accrued warranty cost	12 Months Ended
	Dec. 31, 2014
Accrued warranty cost
Accrued warranty cost	19.Accrued warranty cost
	The movement of Group’s accrued warranty costs for solar module is summarized below:
		As of December		As of December	As of December
		31,		31,	31,
		2012		2013	2014
		RMB		RMB	RMB
	Beginning balance	78,751		114,226	158,897
	Warranty provision	42,167		44,671	92,843
	Warranty utilization	(6,692	)	—	—
	Ending balance	114,226		158,897	251,740

Sharebased_compensation

Share-based compensation	12 Months Ended
	Dec. 31, 2014
Share-based compensation
Share-based compensation	20.Share-based compensation
	As of December 31, 2014, the Company had two share-based compensation plans, which is described below.
	On August 18, 2006, the shareholders of the Company approved the 2006 Stock Incentive Plan (the “2006 Plan”), which permits the grant of share options and shares to its eligible recipients for up to 8,656,000 ordinary shares plus a number of ordinary shares equal to 10% of any additional share capital of the Company issued following the effective date of the 2006 Plan. The Group believes that such awards better align the interests of its employees with those of its shareholders.
	On June 30, 2014, the shareholders of the Company approved the 2014 Stock Incentive Plan (the “2014 Plan”). Under the 2014 Plan, the Company may grant options to purchase 10% of its total issued and outstanding shares as of the date when the board approves the 2014 Plan; provided that, the shares reserved in the award pool shall be increased automatically if and whenever the unissued shares reserved in the award pool accounts for less than 1% of the total then issued and outstanding shares, as a result of which increase the shares unissued and reserved in the award pool immediately after each such increase shall equal to 10% of the then issued and outstanding shares.  The Group believes that such awards better align the interests of its employees with those of its shareholders. In general, the plan administrator determines or the evidence of the award specifies, the vesting schedule for each option grant.
	a)Options
	During the year ended December 31, 2014, the Company granted 3,660,000 ordinary share options to certain of its employees. The exercise price of the options ranges from US$ 1.76 to US$ 1.89.
	The Group recognized a pre-tax charge of RMB 12,980, RMB 3,558 and RMB 14,544 (included in selling, general, and administrative expenses and manufacturing overhead, of which RMB 1,256, RMB 372 and RMB 3 was capitalized in the cost of inventory as of December 31, 2012, 2013 and 2014, respectively), for the years ended December 31, 2012, 2013 and 2014 associated with the expensing of stock options, respectively.
	The weighted-average grant-date fair value of options granted during the year ended December 31, 2012 was US$ 1.4. No option grants were made in 2013. The weighted-average grant-date fair value of options granted during the year ended December 31, 2014 was US$ 1.88. The compensation that has been charged for the option, net of the amounts reversed for options forfeited in excess of amounts estimated at the grant date was RMB 11,724, RMB 3,186 and RMB 14,541 for the years ended December 31, 2012, 2013 and 2014, respectively. The amounts reversed associated with options forfeited were RMB 1,616, RMB 577 and RMB 774 for the years ended December 31, 2012, 2013 and 2014, respectively.  The total income tax benefit recognized in the income statement for share-based compensation arrangements was nil for the periods.
	The Group used the forfeiture rate of 9.82%, 10.92% and 10.05% respectively for the years ended 2012, 2013 and 2014.
	As of December 31, 2012, 2013 and 2014, there was RMB 3,788, RMB 92 and RMB 13,781 of total unrecognized compensation cost related to non-vested share-based employees arrangements granted under the Plan, respectively. The cost is expected to be recognized over a remaining weighted-average period of 25 months.
	The Company expects to issue new shares to satisfy share option exercises.
	These options will become fully vested upon a change in control or on any date at the discretion of the plan administrator. The fair value of option grant is estimated on the date of grant using the Black-Scholes-Merton model with the following assumptions for options granted to employees during the years ended December 31, 2012, 2013 and 2014 respectively:
			For the year ended		For the year ended	For the year ended
			December 31, 2012		December 31, 2013	December 31, 2014
	Average risk-free rate		1.09%~1.27%		—	1.80%~2.01%
	Weighted average expected option life		5.75 years		—	6 years
	Volatility rate		80.5	%	—	56.22%~100.06%
	Dividend		—		—	—
		-1		The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected life of the awards in effect at the time of grant.
		-2		The average expected option life is based on the contractual term of the option and expected employee exercise and post-vesting employment termination behavior. Currently, it is based on the simplified approach.
		-3		The Company has no history or expectation of paying dividends on its ordinary shares.
		-4		The Company chose to use the historical volatility and implied volatility of a basket of comparable publicly-traded companies for a period equal to the expected term preceding the grant date.
	The following table summarizes information with respect to share options outstanding on December 31, 2014:
			Shares		Weighted	Weighted	Intrinsic
					Average	Average	Value (US$,
					Exercise	Remaining	in thousands)
					Price (US$)	Contractual Life
						(Year)
	Outstanding at December 31, 2011		2,690,650		6.71	7.17	—
	Granted		2,207,000		1.4
	Forfeited		(540,600	)	4.6
	Exercised		—		—
	Outstanding at December 31, 2012		4,357,050		4.28	7.62	—
	Granted		—
	Forfeited		(1,373,750	)	1.37
	Exercised		(401,750	)	1.37
	Outstanding at December 31, 2013		2,581,550		4.79	6.4	612
	Granted		3,660,000		1.88
	Forfeited		(296,500	)	2.21
	Exercised		(268,750	)	1.37
	Outstanding at December 31, 2014		5,676,300		3.21	7.59	279
	Exercisable at December 31, 2014		2,261,300		5.23	5.19	273
	The total intrinsic value of options exercised during the years ended December 31, 2012, 2013 and 2014 was $0, $134 and $186, respectively.
	b)Restricted share units (“RSU”)
	RSUs are commitments made to issue ordinary shares at the time that each underlying RSU vests. The RSUs are not legally issued ordinary shares nor do they comprise outstanding ordinary shares and therefore, do not give their holders voting or dividend rights.
	Upon vesting, the shares will be issued by the Company.
	The following table summarizes information with respect to RSUs outstanding on December 31, 2014:
			Shares		Weighted Average
					Fair Value (US$)
	Nonvested at December 31, 2011		2,493,000		5.17
	Granted		90,000		0.79
	Vested		(95,000	)	5.92
	Forfeited		(50,000	)	5.85
	Nonvested at December 31, 2012		2,438,000		4.97
	Granted		—		—
	Vested		(1,281,890	)	5.04
	Forfeited		(140,000	)	4.28
	Nonvested at December 31, 2013		1,016,110		4.95
	Granted		90,000		1.99
	Vested		(85,000	)	5.11
	Forfeited		(62,500	)	5.52
	Nonvested at December 31, 2014		958,610		4.62
	For RSUs, the Company recognized a pre-tax charge of RMB 20,249, RMB 5,843 and RMB 1,737 (included in selling, general, and administrative expenses) for the years ended December 31, 2012, 2013 and 2014, respectively. Unrecognized compensation expense related to the RSUs as of December 31, 2013 and 2014 were RMB 2,437 and RMB 536, respectively. The cost is expected to be recognized over a remaining weighted average period of 5 months.  The fair value of shares vested during the years ended December 31, 2012, 2013 and 2014 was RMB 997, RMB 2,182 and RMB 1,000, respectively.

Foreign_currency_forward_contr

Foreign currency forward contracts	12 Months Ended
	Dec. 31, 2014
Foreign currency forward contracts
Foreign currency forward contracts	21.Foreign currency forward contracts
	The Group, as a result of its global operating and financing activities, is exposed to changes in foreign currency exchange rates which may adversely affect its results of operations and financial position. The Group uses foreign currency forward exchange contracts to hedge the exposure to foreign currency risk, primarily the EUR, GBP, USD and JPY. The purpose of the Group’s foreign currency derivative activities is to protect the Group from the risk that the RMB net cash flows resulting from forecasted foreign currency-denominated transactions will be negatively affected by changes in exchange rates. The Group uses foreign currency forward exchange contracts to offset changes in the amount of future cash flows associated with certain third-party sales expected to occur within the next 12 months.
	The Group accounts for derivative instruments pursuant to ASC 815, Derivatives and Hedging, as amended and interpreted, and recognizes all derivative instruments as either assets or liabilities at fair value in other assets or other liabilities in the Consolidated Balance Sheets. The recognition of gains or losses resulting from changes in the values of those derivative instruments is based on the use of each derivative instrument. The Group has evaluated various factors and determined whether there is effectiveness with respect to certain foreign-currency forward contracts and whether these foreign currency forward exchange contracts qualified for foreign currency cash flow hedge accounting. When the company formally designates a contract as a hedge and the hedging relationships are highly effective, the effective portion of the gain or loss on the derivative cash flow hedges is recorded in accumulated other comprehensive income, net of tax, until the underlying hedged transaction is recognized in the consolidated income statements. The ineffective portion of cash flow hedges, if any, is recognized in income immediately. The effectiveness of designated hedging relationships is tested and documented on quarterly basis. Gains or losses on those foreign currency forward exchange contracts which do not qualify for hedge accounting are recognized in change in fair value of derivatives in the Consolidated Statements of Operations and Comprehensive (Loss)/Income. During the year ended December 31, 2012, the Group entered into foreign exchange forward contracts with a notional amount of Euro 158,463, GBP 4,153 and US Dollar 87,119. During the year ended December 31, 2013, the Group entered into foreign exchange forward contracts with a notional amount of EUR 64,254, GBP 11,453, USD 20,683 and JPY 94,500. During the year ended December 31, 2014, the Group entered into foreign exchange forward contracts with a notional amount of EUR 75,164, GBP 171, USD 25,917 and JPY 922,031. As of December 31, 2013, the Group had outstanding foreign currency forward exchange contracts with notional amounts of EUR 11,082. As of December 31, 2014, the Group had outstanding foreign currency forward exchange contracts with notional amounts of EUR 22,284 and JPY 384,584.
	The gain/(loss) from the change in the fair value on the effective portion of derivative cash flow hedges, which is recorded in accumulated other comprehensive income, net of tax, was RMB (11,755), RMB nil and RMB nil for the years ended December 31, 2012, 2013 and 2014, respectively. The gain/(loss) from the change in the fair value on those foreign currency forward exchange contracts not qualifying for hedge accounting, which is recorded in change in fair value of derivatives, was RMB 9,303, RMB (793) and RMB 10,470 for the years ended December 31, 2012, 2013 and 2014, respectively.
	The following table displays the outstanding notional balances and the estimated fair value of the Group’s foreign-currency forward exchange contracts as of December 31, 2013 and 2014
		As of December 31,	As of December 31,	As of December 31,	As of December 31,
		2013	2013	2014	2014
		RMB	RMB	RMB	RMB
		Notional Amount	Estimate fair value	Notional Amount	Estimate fair value
	Foreign exchange forward contracts not designated as hedging instruments, recorded in other current assets	93,295	237	192,201	5,541

Issuance_of_ordinary_shares_an

Issuance of ordinary shares and warrants	12 Months Ended
	Dec. 31, 2014
Issuance of ordinary shares and warrants
Issuance of ordinary shares and warrants	22.Issuance of ordinary shares and warrants
	On August 14, 2013, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with a single institutional investor, Capital Ventures International (the “Investor”), to issue in a registered direct offering an aggregate of US$ 24 million (RMB equivalent 147,998) for 15,228,425 ordinary shares, US$0.0001 par value per share, of the Company (“Ordinary Shares”), represented by 3,045,685 American Depositary Shares (each, an “ADS”) at a price of US$7.88 per ADS.  The offering price is 94% of the volume-weighted average price of the Company’s ADSs on August 13, 2013 (i.e. US$ 8.383 per ADS per Bloomberg on August 13, 2013).  The offering resulted in net proceeds of RMB128,529, after deducting the placement fees and offering expenses.
	Series A and B Warrants
	In conjunction with the ordinary share offering, the Company also issued to the Investor Series A-1 Warrant, Series A-2 Warrant, Series A-3 Warrant, and Series B Warrant (“Warrants”) to acquire up to 12,724,164 ordinary shares (or 2,544,833 ADSs), 12,724,164 ordinary shares (or 2,544,833 ADSs), 12,724,164 ordinary shares (or 2,544,833 ADSs), and 50,896,656 ordinary shares (or 10,179,332 ADSs), respectively.
	The Series A-1 warrant to purchase ordinary shares can be exercised on or prior to the date that is three months after the date it is issued at an initial exercise price of US$1.886 per ordinary share (equivalent to an exercise price of US$9.43 per ADS), subject to anti-dilution adjustments with respect to issuances of ordinary shares, options or convertible securities, or the modification of issued options or convertible securities. The Series A-2 warrant to purchase ordinary shares can be exercised on or prior to the date that is six months after the date it is issued at an initial exercise price of US$1.886 per ordinary share (equivalent to an exercise price of US$9.43 per ADS), subject to anti-dilution adjustments with respect to issuances of ordinary shares, options or convertible securities, or the modification of issued options or convertible securities. The Series A-3 warrant to purchase ordinary shares can be exercised on or prior to the date that is nine months after the date it is issued at an initial exercise price of US$1.886 per ordinary share (equivalent to an exercise price of US$9.43 per ADS), subject to anti-dilution adjustments with respect to issuances of ordinary shares, options or convertible securities, or the modification of issued options or convertible securities.
	The Series B warrant to purchase up ordinary shares represented by ADSs at an initial exercise price of US$2.18 per ordinary share (equivalent to an exercise price of US$10.90 per ADS), subject to anti-dilution adjustments with respect to issuances of ordinary shares, options or convertible securities, or the modification of issued options or convertible securities, and subject to reset on the date that is nine months after the date it is issued. The Series B Warrant being offered is exercisable on the date that is one day after the one-year anniversary of the date on which it is issued and expires on the date that is two years after the date on which the Series B Warrant is first exercisable.
	At any time after the issuance of warrants, the holders of the warrants shall be entitled to participate in such distribution to the same extent that the Holder would have participated therein if the Holder had held the number of Ordinary Shares and/or ADSs, as applicable, acquirable upon complete exercise of this Warrant (without regard to any limitations on exercise hereof, including without limitation). The holders of the warrants are entitled to receive any dividends paid or distributions made, except with respect to share dividends covered by the anti-dilution adjustment provision of the warrant, to the holders of our ordinary shares to the extent the holders of each warrant would have participated if such holders held a number of shares, acquirable upon exercise of such warrant.
	In November 2013, February 2014, and May 2014, the Series A-1 Warrant, Series A-2 Warrant and Series A-3, respectively, Warrant were exercised in full at the price of US$ 9.43 per ADS. The fair value of warrant liability for Series A-1 Warrant, Series A-2 Warrant and Series A-3 Warrant on respective warrant exercise date was RMB35,693, RMB2,797 and RMB 3,530, respectively, which was reclassified to additional paid-in- capital upon exercises.
	Accordance with ASC subtopic 815-10, the warrants are deemed legally detachable and separately exercisable from the ordinary shares and thus accounted for as a freestanding instrument. As the warrants are denominated in US Dollar, yet the Company’s functional currency is RMB, warrants are not considered indexed to the Company’s own stock. Accordingly, the warrants are liability derivatives which need to be fair valued on day one and mark to market subsequently at each reporting period end, with the fair value gain or loss arising from the re-measurement recognized in the Consolidated Statements of Operations and Comprehensive (Loss)/Income.
	On the transaction date, the sales proceeds are first allocated to the warrant based on the warrants’ full fair value of RMB 172,916 and the residual amount of the sales proceeds is allocated to the ordinary shares. The fair value of the warrants in excess of net proceeds of the equity offering of RMB 44,396, was charged to retained earnings as a deemed dividend due to this portion is a benefit transferred from existing shareholders to the new investor. Such amount charged as deemed dividend on the transaction date and is an adjustment to net loss available to attributable to JA Solar Holdings for basic and diluted EPS calculation, as an effective dividend from existing ordinary shareholders. For the year ended December 31, 2013 and 2014, RMB 51,074 of loss and RMB 74,014 of gain, respectively, was recognized based on a subsequent change in fair value of the warrants in the Company’s Consolidated statements of Operations and Comprehensive (Loss) /Income.(Note 27)
	The series A-1, A-2, A-3 and B warrants are participating securities because they had contractual rights to share in the profits but not losses of the Company. For the year ended December 31, 2013, the computation of basic loss per share using the two-class method was not applicable as the Company was in a net loss position. For the year ended December 31, 2014, the computation of basic loss per share using the two-class method was applicable as the Company was making profit in year 2014

Mainland_China_contribution_pl

Mainland China contribution plan and profit appropriation	12 Months Ended
	Dec. 31, 2014
Mainland China contribution plan and profit appropriation
Mainland China contribution plan and profit appropriation	23.Mainland China contribution plan and profit appropriation
	a)China contribution plan
	Full-time employees of the Group in the PRC participate in a government-mandated multi-employer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. PRC labor regulations require the Group to accrue for these benefits based on certain percentage of the employees’ salaries. However, the Group is not responsible for meeting any obligations under the plan. The total contribution for such employee benefits was RMB 95,929, RMB 96,062 and RMB 104,719 for the years ended December 31, 2012, 2013 and 2014, respectively.
	b)Statutory reserves
	Pursuant to laws applicable to entities incorporated in the PRC, the subsidiaries in the PRC should make appropriations from after-tax profit to non-distributable reserve funds. These reserve funds include the following: (i) a general reserve, (ii) an enterprise expansion fund and (iii) a staff bonus and welfare fund. The subsidiaries in the PRC are required to transfer at least 10% of their profit after taxation (as determined under accounting principles generally accepted in the PRC (“PRC GAAP”) at each year-end)  to the general reserve fund until the reserve balance reaches 50% of their respective registered capital. The appropriations to other funds are at the PRC subsidiaries’ discretion. These reserve funds can only be used for specific purposes of enterprises expansion, staff bonus, and welfare and not distributable as cash dividends.
	The general reserves made by the Group’s PRC subsidiaries in 2012, 2013 and 2014 were RMB nil, RMB 1,760 and 26,657, respectively. During the year ended December 31, 2013, the Group made a reversal of RMB 8,257, from the common statutory reserve fund to retained earnings due to an adjustment related to income tax filing difference was made in its local PRC GAAP accounts.
	c)Restricted capital
	The following paid-in-capital amounts are unavailable for distribution as nominal dividends to the Company:
	Legal Entity	Paid-in Capital
		restricted
	JingAo Solar Co., Ltd.	RMB 1,000,000
	Shanghai JA Solar Technology Co., Ltd.	USD 80,000
	Shanghai JA Solar PV Technology Co., Ltd.	USD 20,000
	JA Solar Technology Yangzhou Co., Ltd.	USD 260,000
	Jing  Hai  Yang  Semiconductor  Materials  (Donghai)  Co., Ltd.	USD 98,000
	JA Yangzhou PV Technology Co., Ltd.	USD 10,000
	Shanghai Jinglong Solar Technology Co., Ltd.	RMB 180,000
	Donghai JA Solar Technology Co., Ltd.	RMB 50,000
	JA (Hefei) Renewable Energy Co., Ltd.	USD 15,000
	Hefei JA Solar Technology Co., Ltd.	RMB 1,440,000
	Solar Silicon Valley Electronic Science and Technology Co., Ltd.	USD 36,986
	JA Solar Investment (China) Co., Ltd.	USD 40,000
	Dunhuang JA Solar Power Development Co., Ltd	RMB 254,000
	Hebei Ningjin Songgong Semiconductor Co., Ltd.	RMB 275,000
	JA Solar PV Technology Co., LTD	USD 10,000
	JA Solar PV Electric (Shexian) Co,. Ltd	RMB 3,000
	Aiyouen Power Electric (Yinchuan) Co,. Ltd	RMB 26,000
	JA Solar PV Electric (Baotou) Co,. Ltd	RMB 2,000
	Beijing JA Solar PV Technology Co., Ltd.	RMB 20,000
	JA Solar PV Electric (Huanghua) Co,. Ltd	RMB 1,000
	JA Solar PV Electric (Yanchi) Co,. Ltd	RMB 4,000
	JA New Energy Development (Hebei) Co., Ltd.	RMB 1,000

Earnings_loss_per_share

Earnings (loss) per share	12 Months Ended
	Dec. 31, 2014
Earnings (loss) per share
Earnings (loss) per share	24.Earnings (loss) per share
	Basic and diluted net (loss)/ earnings per share for the years ended December 31, 2012, 2013 and 2014 are calculated as follows:
			Year ended		Year ended		Year ended
			December 31,		December 31,		December 31,
			2012		2013		2014
			RMB		RMB		RMB
	Numerator:
	Net (loss)/income attributable to JA Solar Holdings		(1,662,257	)	(429,280	)	423,771
	Fair value of warrants in excess of net proceeds of equity offering		—		(44,396	)	—
	Allocation of net income to participating warrant holder		—		—		(77,174	)
	Numerator for basic (loss)/earnings per share		(1,662,257	)	(473,676	)	346,597
	Dilutive effect of:
	Add back allocation to participating warrant holder (1)						4,336
	Excluding portion of fair value gain (2)						(16,716	)
	Numerator for diluted earnings per share		(1,662,257	)	(473,676	)	334,217
	Denominator:
	Denominator for basic loss per share - weighted average ordinary shares outstanding		194,788,429		201,317,884		242,192,859
	Dilutive effect of share options and RSUs*		—		—		363,633
	Dilutive effect of warrants*		—		—		306,592
	Denominator for diluted loss per share		194,788,429		201,317,884		242,863,084
	Basic (loss)/earnings per share		(8.53	)	(2.35	)	1.43
	Diluted (loss)/earnings per share		(8.53	)	(2.35	)	1.38
		-1		Net income has been adjusted to participating Series A-3 Warrant and Series B Warrant holder based on their respective rights to share in dividends in 2014.
		-2		The fair value gain represents the change in fair value of Series A-3 Warrant, which is deducted from income (numerator) in calculating diluted earnings per share. Series A-3 Warrant has dilutive effect as its exercise price of US$ 9.43 per ADS is less than average stock price during the period it was outstanding.
	*. These potentially dilutive share options, RSUs and convertible notes totaling 5,628,371 in 2012 were not included in the calculation of dilutive earnings per share in 2012 because of their anti-dilutive effect.
	* These potentially dilutive share options and RSUs totaling 3,433,109 in 2013 were not included in the calculation of dilutive earnings per share in 2013 because of their anti-dilutive effect.
	* These potentially dilutive warrants 30,806,670 in 2013 were not included in the calculation of dilutive earnings per share in 2013 because of their anti-dilutive effect.
	* These potentially dilutive share options and RSUs totaling 2,856,278 in 2014 were not included in the calculation of dilutive earnings per share in 2014 because of their anti-dilutive effect.
	* These potentially dilutive warrants 52,569,971 in 2014 were not included in the calculation of dilutive earnings per share in 2014 because of their anti-dilutive effect. Series B Warrant is anti-dilutive as the exercise price of US$ 10. 90 per ADS is higher than average stock price during the year.

Related_party_transactions

Related party transactions	12 Months Ended
	Dec. 31, 2014
Related party transactions
Related party transactions	25Related party transactions
	a)Amounts due to related parties consisted of the following:
		As of December 31,	As of December 31,
		2013	2014
		RMB	RMB
	Short-term:
	Payables to Hebei Jinglong Industry and Commerce Group Co., Ltd. (“Hebei Jinglong”)	13,462	8,040
	Payables to Jing Wei Electronics Co., Ltd.(“Jing Wei”)	97,648	84,020
	Payables to Xingtai Jinglong Electronics and Materials Co., Ltd.(“Xingtai Jinglong”)	60,807	63,633
	Payables to Heibei Ningjin Songgong Electronics Co., Ltd. (“Songgong Electronics”)	37,456	17,302
	Payables to Yangguang Guifeng Electronics Co., Ltd.(“Yangguang Guifeng”)	55,965	88,757
	Payables to Ningjin Saimei Ganglong Electronics Co., Ltd. (“Saimei Ganglong”)	—	34,821
	Payables to Hebei Jinglong Fine Chemical Co., Ltd. (“Fine Chemical”)	—	24,827
	Others	61,552	17,917
	Total amounts due to related parties	326,890	339,317
	b)Amounts due from related parties consisted of the following:
		As of December 31,	As of December 31,
		2013	2014
		RMB	RMB
	Short-term:
	Advance to related party suppliers, net
	Advances to Hebei Jinglong	113,000	60,000
	Accounts receivable from related party customers, net
	Receivables from JA Solar PV Electric (Lincheng) Co,. Ltd. (“Lin Cheng”)	—	109,407
	Receivables from Hebei Jinglong	65,567	106,194
	Receivables from Jing Wei	72,510	28,194
	Receivables from Xingtai Jinglong	58,750	19,694
	Receivables from Songgong Electronics	38,598	67,243
	Receivables from Yangguang Guifeng	44,266	40,726
	Receivables from others-short term	16,006	10,818
	Amount due from related parties:
	Loan to Yangzhou JA Property Co., Ltd. (“Yangzhou Property”)	40,000	40,000
	Amount due from others-short term	3,436	7,890
	Long-term:
	Advances to Hebei Jinglong-long term	603	10,145
	Total amounts due from related parties	452,736	500,311
	c)Transactions with Hebei Jinglong
	Wafer supply
	In July 2006, the Group entered into a master long-term supply contract (the “Jinglong Long-term Supply Contract”) with Hebei Jinglong for the supply of silicon wafers. Hebei Jinglong is owned by the shareholders of the largest shareholder of the Company, Jinglong Group Co., Ltd. (“Jinglong BVI”), and thus, is a related party of the Company. Mr. Baofang Jin, our executive chairman, owns 32.96% equity interests in each of Hebei Jinglong and Jinglong BVI. The Jinglong Long-term Supply Contract had an initial term of four and half years, from July 2006 to December 2010, which automatically extended for another three years until the end of 2013. The Group has also entered into various short-term supply contracts with Hebei Jinglong for the supply of silicon wafers (together with the Jinglong Long-term Supply Contract the “Jinglong Supply Contracts”). Under the Jinglong Supply Contracts, Jinglong Group has agreed to supply the Group with silicon wafers at prevailing market prices with a reasonable discount and under prepayment arrangements. The Group has entered into various supplemental agreements to the Jinglong Supply Contracts to specify certain performance terms, including amendment of prepayment amounts and their utilization. The prepayment and delivery terms under the existing Jinglong Long-term Supply Contract had been revised subsequently in August 2007, September 2008, and February 2009.
	The Group reviewed the contracts under ASC 815, Derivatives and Hedging, and ASC 810, Consolidation, and determined that they don’t contain an embedded derivative nor would the supplier contracts cause the supplier to be a variable interest entity.
	For the years ended 31 December 2012, 2013 and 2014, the Group purchased RMB 191,339, RMB 205,047 and RMB 0 respectively, of silicon wafers from Jinglong Group under the Jinglong Supply Contracts.
	Unused prepayments were RMB 113,603 and RMB 70,145 at December 31, 2013 and 2014, respectively, and were recorded in advances to related party supplier in the consolidated balance sheet.
	Outsourcing service
	The Group outsourced wafer processing services to Hebei Jinglong, who helped the Group turn polysilicon into wafers. The outsourcing service fee was RMB17,899, RMB 1,024 and RMB 320 for Hebei Jinglong for the years ended December 31, 2012, 2013 and 2014 respectively.
	Management fees and leasing
	The Group leases properties from Hebei Jinglong and another related party under operating lease agreements. The Group incurred rental expenses under operating lease agreements to Hebei Jinglong in the amounts of RMB 12,000, RMB 42,089 and RMB 47,352 for the years ended December 31, 2012, 2013 and 2014, respectively.
	d)Transactions with other related parties
		For the year ended	For the year ended	For the year ended
		December 31, 2012	December 31, 2013	December 31, 2014
		RMB	RMB	RMB
	Sales of products
	Subsidiaries of Hebei Jinglong	172,623	394,974	73,215
	Ningjin Songgong	67,393	1,531	—
	Others	3,204	—	115,382
	Total	243,220	396,505	188,597
	Purchase of products
	Subsidiaries of Hebei Jinglong	464,511	609,635	1,079,882
	Ningjin Songgong	350,685	35,504	—
	Others	12,515	—	—
	Total	827,711	645,139	1,079,882
	Processing service
	Subsidiaries of Hebei Jinglong	19,086	7,124	14,735
	Others	7,618	—	—
	Total	26,704	7,124	14,735
Purchase of equipment and building
Subsidiaries of Hebei Jinglong	2,481	1,967	2,543
Yangzhou Property	—	—	77,398
Total	2,481	1,967	79,941
Sales of equipment
Subsidiaries of Hebei Jinglong	—	5,000	—
Total	—	5,000	—
Provide entrusted loan
Yangzhou Property	—	40,000	40,000
Total	—	40,000	40,000
Provide Guarantee
Yangzhou Property	—	20,000	—
Total	—	20,000	—
Receive Guarantee
Hebei Jinglong	—	228,000	672,047
Yangzhou Property	—	50,000	80,000
Total	—	278,000	752,047
As of December 31, 2014, the Group provided no guarantees to related parties while as of December 31, 2013, the Group provided guarantees to Yangzhou Property for a short-term borrowing with a principal of RMB 20,000. Meanwhile, the Group received guarantees from Yangzhou Property for a short-term borrowing with a principal of RMB 50,000 and RMB 80,000 in 2013 and 2014, respectively. No amounts have been accrued as a loss contingency related to this guarantee because payment by the Group is not probable. The fair value of the guarantee as of December 31, 2014 was not material. In addition, in June 2013, the Company provided an entrustment loan to Yangzhou Property with a principal of RMB 40,000, with an annual interest rate of 6.6% and will be due for repayment in one year.   In 2014, the repayment date for the entrustment loan is extended to June 8, 2015. In 2014, the Group purchased a block of building from Yangzhou Property for a consideration of RMB 77,398, which was based on the fair value of the building.
The Group considers that these transactions were carried out at arm’s length with prices comparable to other similar transactions with unrelated third parties.

Contingencies_and_Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2014
Contingencies and Commitments
Contingencies and Commitments	26.Contingencies and Commitments
	a)Supplier contract
	In order to better manage the Group’s unit costs and to secure adequate and timely supply of polysilicon and silicon wafers during the periods of shortages of polysilicon and silicon wafer supplies, the Group entered into a number of multi-year supply agreements in amounts that were expected to meet the Group’s anticipated production needs. As a condition to its receiving the raw materials under those agreements, and in line with industry practice, the Group was required to, and has made prepayments for all, or a portion, of the total contract price to the suppliers, which are then offset against future purchases. The Group has completed re-negotiating certain of its supplier arrangements and is currently in the process of re-negotiating the remaining prepayment obligations with its suppliers.
	Set out below are the Group’s fixed obligations under these multi-year contracts including “take or pay” arrangements.
	Obligations under Multi-year Supply Agreements, including “Take or Pay” Supply Agreements
	The Group’s multi-year supply agreements with some suppliers are structured as fixed price and quantity “take or pay” arrangements which allow the supplier to invoice the Group for the full stated purchase price of polysilicon or silicon wafers the Group is obligated to purchase each year, whether or not the Group actually purchases the contractual volume. In the years ended December 31, 2013 and 2014, the Company failed to perform purchase obligations of RMB 259 million and 507 million, respectively, under a take-or-pay supply agreement with Supplier D, as it is currently renegotiating with Supplier D. While its take-or-pay arrangements pursuant to certain LTAs are characterized as unconditional purchase commitments which require disclosure under ASC 440-10-50-2 and 4, a separate assessment is performed to determine whether losses should be accrued on those inventory purchase commitments in accordance with ASC 330-10-35-17 to 18. (Refer to Note 2(g) and Note 7 Inventories).
	In addition to the “take or pay” supply agreements, the Group has also entered into other multi-year supply agreements to purchase fixed volumes of polysilicon or silicon wafers from certain suppliers. Under these agreements, the purchase price is to be periodically adjusted based on prevailing market price or relevant energy price index. Purchases made under “take or pay” agreements amounted to RMB 1,098,601, RMB 957,358 and RMB 1,581,048 for the years ended December 31, 2012, 2013 and 2014, respectively. The Group’s future obligations under multi-year supply agreements, including “take or pay” supply agreements are as follows:
		“Take or pay”	Other	Total
		supply	Multi-year
		agreements	supply
			agreements *
		(in RMB)	(in RMB)	(in RMB)
	Twelve Months Ending December 31
	2015	2,674,655	299,788	2,974,443
	2016	1,634,874	382,227	2,017,101
	2017	1,598,344	—	1,598,344
	2018	1,561,813	—	1,561,813
	2019	1,525,283	—	1,525,283
	Thereafter	761,816	—	761,816
	Total	9,756,785	682,015	10,438,800
	* includes only purchase commitments with fixed or minimum price provisions.
	In addition, the Group has also entered into other supply agreements with variable price provisions, under which the purchase price is based on market prices with price adjustment terms. The Group has committed to purchase polysilicon and silicon wafers with the quantity of 0 metric tons and 720 million pieces respectively during 2015 to 2017, which are with variable price provisions and not included in the above table.
	Outstanding supplier advances made to suppliers with whom the Group has entered into “take or pay” arrangements amounted to RMB 732,394 and RMB 561,363 as of December 31, 2013 and 2014, respectively.
	If the Group fails to meet the obligations, including purchase quantity commitments, under the amended agreements and are unable to further renegotiate the terms of these multi-year supply agreements, the Group may be forced to forfeit certain prepayment amounts and be subject to claims or other disputes which could materially and adversely affect the Group’s results of operations, and financial position.
	b)Long-term supply contract with Supplier D
	The Group entered into a long-term polysilicon supply contract with supplier D in March 2011 and the agreement is structured as fixed price and quantity “take or pay” arrangement from 2013 to 2020. Under the long-term supply contract, the Group is required to make the advance payments and purchase a contracted minimum volume of polysilicon at predetermined fixed prices and in accordance with a pre-determined schedule, commencing January 1, 2013. Due to significant decrease of silicon price in the market and uncertainties brought by anti-dumping and anti-subsidy tariff imposed after the supply contract was signed, the Group believes the performance of the contract is commercially unreasonable and therefore, the Group did not make the full advance payment and accept any delivery in 2013 and 2014. On March 31, 2015, such supplier gave notice to the Group to terminate the longer-term polysilicon supply contract with immediate effect. Supplier D stated that the reason for the termination was an alleged breach of the supply contract by the Group and demanded that the Group pay US$921 million, which are comprised of the remaining advance prepayments, take-or-pay for the period from 2013 to 2020 and the financial penalty for the late payments till March 31, 2015. The Group is still in the process of renegotiating with such supplier on various terms. The Group also assessed whether there would be loss on firm purchase commitments by applying a methodology similar to that used in the lower of cost or market evaluation with respect to inventory, and concluded that no loss provision under the LTA with Supplier D should be provided as of December 31, 2013 and 2014 (Refer to Note 7 Inventories). However, the Group’s efforts to renegotiate with such supplier may not be successful. As of December 31, 2014, the Group has made a full provision against the balance of advance payment of RMB63.3 million (US$10.2 million) made to such supplier under the long-term supply contract. The Group may also be subject to lawsuit or other forms of dispute resolutions and be exposed to potential judgment of damages if the Group’s renegotiation efforts are unsuccessful, which may have a material and adverse effect on the Group’s business, financial condition, results of operations and prospects. At this point, the Group assessed the loss is probable. However, it cannot reasonably estimate the amount of probable loss and low end of range is zero.
	c)Operating lease commitments
	As of December 31, 2014, the Group has several operating lease agreements to lease certain assets, including offices, dormitory and land. These non-cancelable operating leases expire from July 2010 to May 2017, with rental fees that approximates market rents.
	Future minimum obligations for operating leases are as follows:
		(in RMB)
	2015	65,387
	2016	41,751
	2017	1,790
	2018	—
	Thereafter	—
	Total	108,928
	Rent expense under all operating leases was RMB 23,357, RMB 53,422 and RMB 61,950, for the years ended December 31, 2012, 2013 and 2014, respectively.
	d)Capital expenditure
	As of December 31, 2014, the Group had contracted for capital expenditure on machinery and equipment of RMB 427,420.

Fair_value_measurements

Fair value measurements	12 Months Ended
	Dec. 31, 2014
Fair value measurements
Fair value measurements	27.Fair value measurements
	ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Group. Unobservable inputs are inputs that reflect the Group’s assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. As such, fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. The hierarchy is broken down into three levels based on the reliability of inputs as follows:
		·		Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Group has the ability to access.
		·		Level 2—Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly.
		·		Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.
	When available, the Group uses quoted market prices to determine the fair value of an asset or liability. If quoted market prices are not available, the Group will measure fair value using valuation techniques that use, when possible, current market-based or independently sourced market parameters, such as interest rates and currency rates. Following is a description of the valuation techniques that the Group uses to measure the fair value of assets and liabilities that the Group measures and reports on its balance sheet at fair value on a recurring basis.
	Short-term financial instruments: The Group’s short-term financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable and payable, notes receivable, short-term borrowings, and accrued expenses. The cost approximates the fair value because of the short maturity period.
	Long-term borrowings: The fair value is based on the amount of future cash flows associated with each debt instrument discounted at the Group’s current borrowing rate for similar debt instruments of comparable terms. The carrying values of the long-term borrowings approximate their fair values as all the long-term borrowings carries variable interest rates which approximate rates currently offered by the Group’s bankers for similar debt instruments of comparable maturities.
	Derivative assets and liabilities.   The Group’s derivative assets and liabilities consist of embedded foreign currency derivatives in the Group’s sales and purchase contracts denominated in currencies other than Renminbi or the functional currency of the counterparty, the capped call transactions denominated in USD, embedded derivatives underlying convertible notes, foreign currency forward contract instruments and warrants derivatives . Since its capped call transactions, embedded derivatives underlying convertible notes and warrants derivatives  are not traded on an exchange, they are valued using valuation models. Management is responsible for determining these fair values and considered a number of factors including valuations. The capped call transactions are valued using the Black Scholes Option Pricing Model. The embedded derivatives underlying convertible notes and warrants derivatives are bifurcated using the “with or without” approach. As there are interrelationships among the embedded derivatives, they are valued using a Monte Carlo simulation. Interest rate yield curves, foreign exchange rates, stock price, volatility, expected term, risk-free rate and fundamental change event probabilities are the significant inputs into these valuation models. The inputs used in the valuation of the capped call transactions are observable in active markets over the terms of the instruments the Group holds, and accordingly, the Group classifies these valuation techniques as Level 2 in the hierarchy. In regards to the embedded derivatives underlying convertible notes and warrants derivatives, fair value was determined using a “with and without” approach which was based on both Level 2 and Level 3 inputs. The Group determined that the Level 3 input, that is the fundamental change event probabilities, is significant to the overall fair value measurement. The Group considered the effect of its own credit standing and that of its counterparties in its valuations of its derivative financial instruments. The Group entered into foreign currency forward contracts that are designated as cash flow hedges of exchange rate risk related to forecasted foreign currency denominated sales. The Group’s financial instrument counterparties are high-quality commercial banks with significant experience with such instruments.  Fair values of the Group’s forward contracts are determined using significant other observable inputs (Level 2 fair value measurements), and are based on the present value of expected future cash flows considering the risks involved and using discount rates appropriate for the duration of the contracts.
	Recurring change in fair value
	As of December 31, 2013, information about inputs into the fair value measurements of the Group’s assets and liabilities that are measured at fair value on a recurring basis in periods subsequent to their initial recognition is as follows:
			Fair Value Measurements at Reporting Date Using
	Description		Balance as of		Quoted Prices in		Significant Other	Significant
			31 December		Active Markets		Observable Inputs	Unobservable
			2013		for Identical		(Level 2)	Inputs
					Assets (Level 1)			(Level 3)
	Assets:
	Foreign exchange forward contract instruments		237		—		237	—
	Liabilities:
	Derivatives liabilities - warrants		(185,365	)				(185,365	)
	As of December 31, 2014, information about inputs into the fair value measurements of the Group’s assets and liabilities that are measured at fair value on a recurring basis in periods subsequent to their initial recognition is as follows:
			Fair Value Measurements at Reporting Date Using
	Description		Balance as of		Quoted Prices in		Significant Other	Significant
			31 December		Active Markets		Observable Inputs	Unobservable
			2014		for Identical		(Level 2)	Inputs
					Assets (Level 1)			(Level 3)
	Assets:
	Foreign exchange forward contract instruments		5,541		—		5,541	—
	Liabilities:
	Derivatives liabilities - warrants		(105,785	)				(105,785	)
	Assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3 valuation)
	A summary of changes in Level 3 warrant derivatives for the year ended December 31, 2013 was as follows:
	Balance at December 31, 2012		—
	Fair value balance as of Aug. 13, 2013		(172,916	)
	Unrealized gain included in change in fair value of warrant derivatives		(51,074	)
	Exercise of warrants reclassified to additional paid –in capital		35,701
	Exchange gain		2,924
	Balance at December 31, 2013		(185,365	)
	A summary of changes in Level 3 warrant derivatives for the year ended December 31, 2014 was as follows:
	Balance at December 31, 2013		(185,365	)
	Unrealized gain included in change in fair value of warrant derivatives		74,014
	Exercise of warrants reclassified to additional paid –in capital		6,343
	Exchange gain		(777	)
	Balance at December 31, 2014		(105,785	)
	Assets valued at Fair Value on a Non-recurring basis
	As of December 31, 2012
			Fair Value Measurements at Reporting Date Using
	Description		Balance as of		Quoted Prices in		Significant Other	Significant		Total
			31 December		Active Markets		Observable Inputs	Unobservable		(losses)
			2012		for Identical		(Level 2)	Inputs
					Assets (Level 1)			(Level 3)
	Assets:
	Long-lived assets		515,854		—		—	515,854		(397,789	)
	Investment in a joint venture		50,910		—		—	50,910		(38,000	)
	The long-lived assets represent property, plant and equipment for production of multi-crystalline wafers and certain machines which cannot be used for production due to poor physical condition or outdated facilities.
	In accordance with the provisions of the Impairment or Disposal of Long-Lived Assets Subsections of FASB Codification Subtopic 360—10, long-lived assets held and used with a carrying amount of RMB 913,643 were written down to their fair value of RMB 515,854, resulting in an impairment charge of RMB 397,789, which was calculated based on Level 3 Inputs and included in earnings for the period.
	Investment in a joint venture represents investment in JA MEMC with a carrying amount of RMB 50,910. An other-than-temporary impairment charge of RMB 38,000 was recorded against the investment in JA MEMC in the year ended December 31, 2012.
	Change in fair value of derivatives
	The Change in fair value of derivatives recognized in earnings, excluding embedded derivatives underlying convertible notes repurchased which are recognized in buyback gain, was as follows:
			For the year ended		For the year ended		For the year ended
			December 31, 2012		December 31, 2013		December 31, 2014
	Embedded derivatives underlying convertible notes		32		—		—
	Derivatives liabilities - warrants		—		(51,074	)	74,014
	Foreign exchange forward contracts not designated as hedging instruments		9,302		(793	)	10,470
		9,334		(51,867	)	84,484

Segment_information

Segment information	12 Months Ended
	Dec. 31, 2014
Segment information
Segment information	28.Segment information
	The Group operates in a single business segment that includes the design, development, and manufacture of PV products. The following table summarizes the Group’s net revenues generated from different geographic locations:
		Year Ended December 31,
		2012	2013	2014
		RMB	RMB	RMB
	China	3,086,589	3,001,498	3,741,732
	Outside China:
	Germany	1,265,827	660,589	202,315
	Japan	436,443	1,596,703	3,852,572
	Rest of the world	1,930,206	1,923,999	3,498,904
	Total outside China	3,632,476	4,181,291	7,553,791
	Total net revenue	6,719,065	7,182,789	11,295,523
	The Group’s long-lived fixed assets are all located in China.

Certain_risks_and_uncertaintie

Certain risks and uncertainties	12 Months Ended
	Dec. 31, 2014
Certain risks and uncertainties
Certain risks and uncertainties	29.Certain risks and uncertainties
	a)Major customers
	There is no individual customer accounting for 10% or more of total revenues for the years ended December 31, 2012. For the year ended December 31, 2013 and 2014, there is one customer located in Japan accounting for 18.6% and 28.8% of total revenue.
	Accounts receivable from the 3 customers with the largest receivable balances represents 17% and 17% of the balance of accounts receivable at December 31, 2013 and 2014, respectively. The Group performs ongoing credit evaluations of its customers’ financial condition whenever deemed necessary and generally does not require collateral. The Group maintains an allowance for doubtful accounts based upon the expected collectability of all accounts receivable, which takes into consideration an analysis of historical bad debts, specific customer creditworthiness and current economic trends.
	b)Concentrations of credit risk
	Financial instruments that potentially subject the Group to significant concentrations of credit risk consist principally of cash and cash equivalent, accounts receivables and advances to suppliers.
	The Group places its cash and cash equivalents with high quality financial institutions in the PRC, US, Hong Kong and Singapore and limits the amount of credit risk from any single institution. China does not have an official deposit insurance program, nor does it have an agency similar to The Federal Deposit Insurance Corporation (FDIC) in the United States. However, the Group believes that the risk of failure of any of these PRC banks is remote. Bank failure is extremely uncommon in China and the Group believes that those Chinese banks that hold the Company’s cash, cash equivalents and long term time deposit are financially sound based on public available information.
	The Group is also exposed to the credit and financial risks of its suppliers to which the Group made advances. The Group’s financial condition and results of operations may be materially affected if the suppliers fail to meet their obligations of supplying silicon materials according to the contractually agreed schedules.
	c)Foreign currency risk
	The RMB is not a freely convertible currency. The PRC State Administration for Foreign Exchange, under the authority of the People’s Bank of China, controls the conversion of RMB into foreign currencies. The value of the RMB is subject to changes in central government policies and to international economic and political developments affecting supply and demand in the PRC foreign exchange trading system market. The Group’s aggregate amount of cash and cash equivalents denominated in RMB amounted to RMB 1,180,356 and RMB 1,121,695 as of December 31, 2013 and 2014, respectively.

Ordinary_shares

Ordinary shares	12 Months Ended
	Dec. 31, 2014
Ordinary shares
Ordinary shares	30Ordinary shares
	The holders of ordinary shares in the Company are entitled to one vote per share and to receive ratably such dividends, if any, as may be declared by the board of directors of the Company. In the event of liquidation, the holders of ordinary shares are entitled to share ratably in all assets remaining after payment of liabilities. The ordinary shares have no preemptive, conversion, or other subscription rights.

Subsequent_events

Subsequent events	12 Months Ended
	Dec. 31, 2014
Subsequent events
Subsequent events	31.Subsequent events
	The Group has performed an evaluation of subsequent events through the date the consolidated financial statements were issued.

Restricted_net_assets

Restricted net assets	12 Months Ended
	Dec. 31, 2014
Restricted net assets
Restricted net assets	32. Restricted net assets
	Relevant PRC laws and regulations permit PRC companies to pay dividends only out of their retained earnings, if any, as determined in accordance with PRC accounting standards and regulations.  Additionally, the Company’s subsidiaries can only distribute dividends upon approval of the shareholders after they have met the PRC requirements for appropriation to statutory reserve. The statutory general reserve fund requires annual appropriations of 10% of net after-tax income should be set aside prior to payment of any dividends. As a result of these and other restrictions under PRC laws and regulations, the PRC subsidiaries and affiliates are restricted in their ability to transfer a portion of their net assets to the Company either in the form of dividends, loans or advances, which restricted portion amounted to approximately RMB 7,174,059 or 133.8% of the Company total consolidated net assets as of December 31, 2014. Even though the Company currently does not require any such dividends, loans or advances from the PRC subsidiaries and affiliates for working capital and other funding purposes, the Company may in the future require additional cash resources from its PRC subsidiaries and affiliates due to changes in business conditions, to fund future acquisitions and developments, or merely declare and pay dividends to or distributions to the Company’s shareholders, and if applicable, to the noncontrolling interest.

Additional_information_condens

Additional information - condensed financial statements of the Company	12 Months Ended
	Dec. 31, 2014
Additional information - condensed financial statements of the Company
Additional information - condensed financial statements of the Company	33.Additional information — condensed financial statements of the Company
	The separate condensed financial statements of JA Solar Holdings Co., Ltd. as presented below have been prepared in accordance with Securities and Exchange Commission Regulation S-X Rule 5-04 and Rule 12-04 and present the Company’s investments in its subsidiaries under the equity method of accounting as prescribed in ASC 323. Such investment is presented on the separate condensed balance sheets of the Company as “Investments in subsidiaries.” The condensed financial information of JA Solar Holdings Co., Ltd. has been presented for the period from January 1, 2012 to December 31, 2014.
	The subsidiaries did not pay dividend to the Company for the period presented.
	Except as disclosed in the consolidated financial statements as presented above, the Company did not have any significant contingency, commitment, long term obligation, or guarantee as of December 31, 2014.
		For the year		For the year		For the year
		ended		ended		ended
		December 31,		December 31,		December 31,
		2012		2013		2014
		RMB		RMB		RMB
	Revenues	—		—		—
	Total operating expenses	(22,576	)	(24,368	)	(38,940	)
	Loss from operations	(22,576	)	(24,368	)	(38,940	)
	Interest expense	(192,618	)	(47,330	)	—
	Change in fair value of derivatives	32		(51,074	)	74,014
	Share of (loss)/income from subsidiaries	(1,809,926	)	(246,909	)	380,263
	Convertible bond buyback loss	(8,466	)	—		—
	Other income/(loss)	371,297		(59,599	)	8,434
	Income/(loss) before income taxes	(1,662,257	)	(429,280	)	423,771
	Net (loss)/income	(1,662,257	)	(429,280	)	423,771
	Less: fair value of warrants in excess of net proceeds of equity offering	—		44,396		—
	Net (loss)/income attributable to JA Solar Holdings	(1,662,257	)	(473,676	)	423,771
		December 31,		December 31,
		2013		2014
		RMB		RMB
	ASSETS
	Current assets:
	Cash and cash equivalents	34,293		29,223
	Other receivable from subsidiaries	244,772		—
	Other current assets	3,631		2,257
	Total current assets	282,696		31,480
	Investments in subsidiaries	2,579,236		2,978,282
	Amount due from subsidiaries	2,557,138		2,566,506
	Total assets	5,419,070		5,576,268
	LIABILITIES AND SHAREHOLDERS’ EQUITY
	Current liabilities:
	Other payables to subsidiaries and employees	7,788		6,364
	Accrued and other liabilities	3,611		11,454
	Derivatives liabilities - warrants	31,106		105,785
	Total current liabilities	42,505		123,603
	Long-term amount due to subsidiaries	602,044		92,493
	Derivatives liabilities - warrants	154,259		—
	Total liabilities	798,808		216,096
	Commitments and Contingencies
	Shareholders’ equity  :
	Ordinary shares (US$0.0001 par value; 500,000,000 shares authorized, 227,499,837 and 252,301,917 shares issued and outstanding as of December 31, 2013 and December 31, 2014)	170		186
	Additional paid-in capital	5,327,177		5,638,703
	Accumulated deficit	(713,574	)	(289,803	)
	Accumulated other comprehensive income	6,489		11,086
	Total shareholders’ equity	4,620,262		5,360,172
	Total liabilities and shareholders’ equity	5,419,070		5,576,268
		For the year		For the year		For the year
		ended December		ended December		ended December
		31, 2012		31, 2013		31, 2014
		RMB		RMB		RMB
	Cash flows from operating activities:
	Net (loss)/Income	(1,662,257	)	(429,280	)	423,771
	Adjustments to reconcile net loss to net cash used in operating activities:
	Share-based compensation expense	2,055		1,960		4,985
	Share of (loss)/income from subsidiaries	1,809,926		246,909		(380,263	)
	Amortization of deferred issuance cost and increase in accretion of convertible notes	135,725		35,030		—
	Change in the fair value of derivatives	(32	)	51,074		(74,014	)
	Exchange loss/(income)	4,422		85,032		(11,636	)
	Loss from senior convertible notes buyback	8,466		—		—
	Gain from sales of claim against loaned shares	(369,153	)	—		—
Changes in operating assets and liabilities:
Decrease/(increase) in other current assets	(3,227	)	1,651		1,374
Increase/(decrease) in other payables to subsidiaries and employees	—		1,216		(1,424	)
(Decrease)/increase in accrued and other liabilities	(33,728	)	(10,978	)	7,843
Decrease in interest payable	(3,746	)	(4,123	)	—
Net cash used in operating activities	(111,549	)	(21,509	)	(29,364	)
Cash flows from investing activities:
Loans granted to subsidiaries	(12,349	)	—		—
Loans repayment by subsidiaries	125,710		133,458		244,772
Net cash provided by investing activities	113,361		133,458		244,772
Cash flows from financing activities:
Proceeds from long-term loan from subsidiaries	211,193		623,759		—
Repurchase of senior convertible notes	(617,937	)	(740,027	)	—
Proceeds from sales of claim against loaned shares	369,153		—		—
Proceeds from issuance of ordinary shares	—		128,529		—
Proceeds from issuance of ordinary shares upon exercise of warrants	—		143,107		286,747
Repurchase of ADS	(15,276	)	—		—
Repayment of long-term loan from subsidiaries	(12,571	)	(253,629	)	(509,571	)
Proceeds from exercise of stock options	—		3,389		2,171
Net cash provided by/(used in) financing activities	(65,438	)	(94,872	)	(220,653	)
Effect of exchange rate changes on cash and cash equivalents	3,628		205		175
Net (decrease)/increase in cash and cash equivalents	(59,998	)	17,282		(5,070	)
Cash and cash equivalents at the beginning of the year	77,009		17,011		34,293
Cash and cash equivalents at the end of the year	17,011		34,293		29,223

Summary_of_significant_account1

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2014
Summary of significant accounting policies
Basis of presentation and consolidation	a)Basis of presentation and consolidation
	The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). The consolidated financial statements include the financial statements of the Company and its subsidiaries. For consolidated subsidiaries where the Company’s ownership in the subsidiary is less than 100%, the equity interest not held by the Company is presented as noncontrolling interest. All inter-company transactions and balances among the Company and its subsidiaries have been eliminated upon consolidation.
Use of estimates	b)Use of estimates
	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. The Company bases its estimates on historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Significant accounting estimates reflected in the Company’s consolidated financial statements include allowance for doubtful accounts and advances to suppliers, valuation of inventories, derivative and other financial instruments, useful lives of long-lived assets, assumptions used to measure impairment of long-lived assets and equity method investment, determination of fair value of identifiable assets and liabilities acquired through business combination, accrual for warranty and other liabilities, provision for uncertain tax positions and deferred tax valuation allowances, loss contingency, provision for inventory purchase commitment and assumptions used in the computation of share-based compensation, including the associated forfeiture rates.
Fair value of financial instruments	c)Fair value of financial instruments
	The Company estimated the fair value of its financial assets and liabilities in accordance with ASC 820, Fair Value Measurements and Disclosure. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (also referred to as an exit price). ASC 820 establishes a hierarchy for inputs used in measuring fair value that gives the highest priority to observable inputs and the lowest priority to unobservable inputs. Valuation techniques used to measure fair value shall maximize the use of observable inputs.
	When available, the Company measures the fair value of financial instruments based on quoted market prices in active markets, valuation techniques that use observable market-based inputs or unobservable inputs that are corroborated by market data. Pricing information the Company obtains from third parties is internally validated for reasonableness prior to use in the consolidated financial statements. When observable market prices are not readily available, the Company generally estimates the fair value using valuation techniques that rely on alternate market data or inputs that are generally less readily observable from objective sources and are estimated based on pertinent information available at the time of the applicable reporting periods. In certain cases, fair values are not subject to precise quantification or verification and may fluctuate as economic and market factors vary and the Company’s evaluation of those factors changes. Although the Company uses its best judgment in estimating the fair value of these financial instruments, there are inherent limitations in any estimation technique. In these cases, a minor change in an assumption could result in a significant change in its estimate of fair value, thereby increasing or decreasing the amounts of the Company’s consolidated assets, liabilities, shareholders’ equity and net income or loss.
Cash, cash equivalents and restricted cash	d)Cash, cash equivalents and restricted cash
	The Group considers all cash on hand and demand deposits as cash and considers all highly liquid investments with an original maturity of three months or less as cash equivalents. Restricted cash as of December 31, 2013 and 2014 represents amounts held by banks, which are not available for the Group’s use, as collateral for issuance of letters of credit, letters of guarantee, bank acceptance notes as well as certain borrowings.
Investments	e)Investments
	Investments in entities where the Group does not have a controlling financial interest, but have the ability to exercise significant influence over the operating and financial policies of the investee, are accounted for using the equity method of accounting. Investment in a joint venture or an affiliate is accounted for by the equity method of accounting as the Group has the ability to exercise significant influence but does not own a majority equity interest. Under the equity method of accounting, the Group’s share of the investee’s results of operations is included in equity gain/(loss) for the investee in the Group’s Consolidated Statements of Operations and Comprehensive (Loss)/Income. Unrealized gains on transactions between the Company and the joint venture or affiliate are eliminated to the extent of the Group’s interest in the joint venture or affiliate, if any; unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the asset transferred. When the Group’s share of losses in the joint venture or affiliate equals or exceeds its interest in the joint venture or affiliate, the Group does not recognize further losses, unless the Group has incurred obligations or made payments on behalf of the joint venture or affiliate.
Account receivables and allowance for doubtful accounts	f)Account receivables and allowance for doubtful accounts
	Provisions are made against accounts receivable for estimated losses resulting from the inability of the Group’s customers to make payments. The Group periodically assesses accounts receivable balances to determine whether an allowance for doubtful accounts should be made based upon historical bad debts, specific customer creditworthiness and current economic trends. Accounts receivables in the balance sheets are stated net of such provision.
	The Group assesses the credit line and credit term for each customer, taking into consideration the credit worthiness of such customer, the payment history of such customer and macro-economic conditions of the regional market. The Group signs the sales contract and executes the transaction with the customer after sufficient credit assessment. After the sales are made, the Group closely monitors the collectability of receivables on an on-going basis for any subsequent changes in the customers’ financial position and credit rating, and any relevant circumstances which may impact collectability of the receivables. The Group generally will not enter into further transactions with any customers with significant overdue balances.
Inventories	g)Inventories
	Inventories are stated at the lower of cost or market value. Cost of inventories is determined by the weighted-average method. Cost of work-in-progress and finished goods are comprised of direct materials, direct labor and related manufacturing overhead based on normal operating capacity. Adjustments are recorded to write down the carrying amount of any obsolete and excess inventory to its estimated net realizable value. Certain factors could impact the realizable value of inventory, so the Group continually evaluates the recoverability based on assumptions about customer demand and market conditions. The evaluation may take into consideration historical usage, expected demand, anticipated sales price, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, customer concentrations, and other factors. The write-down is equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand and market conditions.  If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required that could negatively impact the Group’s gross margin and operating results. If actual market conditions are more favorable, the Group may have higher gross margin when products that have been previously written down are eventually sold.
	The Company assesses whether losses should be accrued on long-term inventory purchase commitments in accordance with ASC 330-10-35-17 to 18, which requires that losses that are expected to arise from those firm, non-cancellable, and unhedged commitments for the future purchase of inventory items, measured in the same way as inventory losses, should be recognized unless recoverable through firm sales contacts or when there are other circumstances that reasonably assure continuing sales without price decline.
	Under the long-term supply contracts (“LTAs”) between the Company and certain suppliers, polysilicon and silicon wafer purchase would be made pursuant to the purchase prices and quantities set forth in the relevant LTAs. As a result of the significant declines in the market prices of polysilicon and silicon wafer due to the significant downturn in the solar industry in recent years, the purchase prices set forth in certain LTAs exceeded market prices.
	At the end of each reporting period, the Company separately assesses the potential losses on those firm inventory purchases for each supplier. When making the assessment, the Company considers whether it is able to renegotiate with its suppliers and get positive outcome by taking into account various considerations, such as stated contract price, purchase price reduction, overall amendment to LTA to eliminate fixed price arrangement, its ability to obtain concessions (i.e., reduced purchase prices and/or additional quantities at no cost) so that the actual purchase prices are less than the stated contract prices or close to the market price at the time of purchase, historical outcome of the renegotiation with the same supplier, contract period, the minimum purchase quantity, tax costs involved in the import or export of raw materials and products, status of a particular LTA at the time of assessment, and other circumstances and uncertainties that may impact such assessment.
	If it is determined that a loss provision calculation is necessary considering the status of a LTA and all facts and circumstances impacting the evaluation, the Company follows the guidance of ASC 330-10-35-17 and assesses whether there should be loss on the firm purchase commitments by applying a methodology similar to that used in the lower of cost or market evaluation with respect to inventory. In assessing the potential loss provision, the Company uses the stated contract price and volume under the relevant LTA as the major assumptions. Loss provision will be provided if the net realizable value after considering estimated costs to convert those polysilicon into saleable finished goods is higher than market selling price of finished goods as of the end of a reporting period
	There was no loss provision recorded related to these long-term contracts in the years ended December 31, 2012, 2013 and 2014. (Refer to Note 7 Inventories)
Short-term and long-term advances to suppliers	h)Short-term and long-term advances to suppliers
	The Group provides short-term and long-term advances to secure its raw material needs, which are then offset against future purchases. The Group does not require collateral or other security against its advances to related or third party suppliers. The Group continually assesses the credit quality of its suppliers and the factors that affect the credit risk. If there is deterioration in the creditworthiness of its suppliers, the Group will seek to recover its advances from the suppliers and provide for losses on advances which are akin to receivables in selling, general and administrative expenses because of their inability to return its advances. Recoveries of the allowance for advances to supplier are recognized when they are received. The Group classified short-term and long-term advances to suppliers based on management’s best estimate of the expected purchase in the next twelve-months as of the balance sheet date and the Group’s ability to make requisite purchases under existing supply contracts. The balances expected to be utilized outside of the twelve months are recorded in long-term advances to suppliers.
Prepaid land use rights	i)Prepaid land use rights
	Land use rights are carried at cost less accumulated amortization and impairment losses, if any.  Amortization is provided on a straight-line basis over the lease period of 40 or 50 years.
Property, plant and equipment, net	j)Property, plant and equipment, net
	Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is provided on a straight-line basis over the following estimated useful lives:
	Buildings	20 years
	Leasehold improvements	Shorter of the lease term or their estimated useful lives
	Machinery and equipment	5-15 years
	Furniture and fixtures	5 years
	Motor vehicles	5 years
	Construction in progress primarily represents the construction of new production lines. Costs incurred in the construction are capitalized and transferred to property, plant and equipment when an asset is ready for its intended use, at which time depreciation commences. Interest expense incurred for qualifying assets are capitalized in accordance with ASC 835-20, Capitalization of Interest.
	Expenditures for repairs and maintenance are expensed as incurred. The gain or loss on disposal of property, plant and equipment, if any, is the difference between the net sales proceeds and the carrying amount of the disposed assets, and is recognized in the Consolidated Statements of Operations and Comprehensive Loss upon disposal.
Operating leases	k)Operating leases
	Leases where substantially all the rewards and risks of ownership of assets remain with the leasing company are accounted for as operating leases. Payments made under operating leases are charged to the Consolidated Statements of Operations and Comprehensive Loss on a straight-line basis over the lease periods.
Business combination	l)Business combination
	Business combinations are accounted for under the acquisition method in accordance with ASC 805, Business Combinations. The consideration transferred is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date, irrespective of the extent of any non-controlling interests. The excess of the (i) the fair value of consideration transferred , fair value of the non controlling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree is recorded as goodwill. If the fair value of consideration transferred, fair value of the non-controlling interests and acquisition date fair value of any previously held equity interest in the acquire is less than the fair value of the net assets of the entity acquired, the difference, a bargain purchase, is recognized as a gain directly in the Statements of Operations and Comprehensive Loss upon obtaining control. In a business combination achieved in stages, the acquirer shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in earnings.
	The determination and allocation of fair values to the identifiable assets acquired and liabilities assumed, including non-controlling interests if applicable, is based on various assumptions and valuation methodologies requiring considerable management judgment.  The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. Management determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets and forecasted life cycle and forecasted cash flows over that period. Although management believes that the assumptions applied in the determination are reasonable based on information available at the date of acquisition, actual results may differ from the forecasted amounts and the difference could be material.
Intangible asset, net	m)Intangible asset, net
	Intangible assets primarily represent technical know-how, purchased accounting and operational software, and customer relationships acquired through business combinations.
	Technical know-how, contributed by one of the Group’s shareholders upon formation of JA Hebei, is carried at cost, less accumulated amortization. The technical know-how consists of one component relating to the commercial production process of photovoltaic solar cells. Amortization is calculated on a straight-line basis over the estimated useful life of eight years.
	Intangible assets acquired through business combinations are recognized as assets separate from goodwill if they satisfy either the “contractual-legal” or “separability” criterion. Customer relationship is recorded at fair value at the acquisition date less accumulated amortization. Amortization is calculated on a straight-line basis over the estimated useful life of five years.
	Purchased software and others with a finite useful life is being amortized on a straight line basis over its estimated useful life of three to ten years.
Impairment of long-lived assets	n)Impairment of long-lived assets
	The Group evaluates its long-lived assets and finite-lived intangible asset for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Factors considered important that could result in an impairment review include significant underperformance relative to expected historical or projected future operating results, significant changes in the manner of use of acquired assets and significant negative industry or economic trends. Impairments are recognized based on the difference between the fair value of the asset and its carrying value in the event that the carrying amount exceeds the estimated future undiscounted cash flow attributed to such assets. Fair value is generally measured based on either quoted market prices, if available, or discounted cash flow analyses. Additionally, determining fair values requires probability weighting the cash flows to reflect expectations about possible variations in their amounts or timing and the selection of an appropriate discount rate. Although cash flow estimates are based on relevant information available at the time the estimates are made, estimates of future cash flows are, by nature, highly uncertain and may vary significantly from actual results. Any write-downs would be treated as permanent reductions in the carrying amounts of the assets and an operating loss would be recognized.
Income taxes	o)Income taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax assets bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided to reduce the carrying amount of deferred tax assets if it is considered more likely than not that some portion, or all, of the deferred tax assets will not be realized.
	Uncertain tax position is accounted for in accordance with ASC 740-10-25, which clarifies the accounting for uncertain tax positions and requires that the Company recognizes in the consolidated financial statements the impact of an uncertain tax position, if that position is more likely than not of being sustained upon examination, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company’s accounting policy is to accrue interest and penalties related to uncertain tax positions, if and when required, as interest expense and a component of general and administrative expenses, respectively, in the Consolidated Statements of Operations and Comprehensive Loss. In the years ended December 31, 2012, 2013 and 2014, the Group did not record any interest and penalties associated with uncertain tax positions as there were no uncertain tax positions.
Revenue recognition	p)Revenue recognition
		(i)		Revenue recognition for solar modules, solar cells and other products (hereafter “solar products”)
	The Group recognizes revenue from the sale of solar products when the goods are delivered and title and risk of loss transfer is passed to the customers. The Group sells its solar products at agreed upon prices to its customers, which reflect prevailing market prices.
	The Group’s considerations for recognizing revenue are based on the following:
		·		Persuasive evidence that an arrangement (sales contract) exists between a willing customer and the Group that outlines the terms of the sale (including customer information, product specification, quantity of goods, purchase price and payment terms). Customers do not have a right of return. The Group does provide a warranty on its solar module products.
		·		For EX Works (“EXW”) terms, which mean that a seller has the goods ready for collection at its premises (works, factory, warehouse, plant),  the contract specifies that the risks are assumed by the customer when the customer picks up the goods from the Company’s warehouse, at which time revenue is recognized. For FOB shipping point terms, the contract specifies that the customer takes title to the goods and is responsible for all risks and rewards of ownership once products are over shipping rail at the named loading port from the Company’s premises, at which time revenue is recognized. For CIF terms, the Company pays the costs of insurance and freight necessary to bring the goods to the named port of destination, but the title to and risk/rewards of ownership of the goods is passed to the buyer according to each of the contract term, which is defined in each contract. For Delivered Duty Paid (“DDP”) terms, the Company pays the costs of insurance and freight necessary to bring the goods to the named port of destination as well as the import duty, and the title to and risk/rewards of ownership of the goods is passed to the buyer once the goods are delivered and the import duty is paid. The point of delivery could be at the port of shipping, or it could also be when the goods arrive at the named port of destination. When title to the goods transfers at the port of shipping, the beneficiary of the insurance is the buyer and the Company has no obligations to the buyer if goods are damaged during shipping. Revenue is therefore, recognized when the title to and risk/rewards of ownership of the goods is passed to the buyer which is at port of shipping or port of destination, depending on the terms of the contract.
		·		The Group’s price to the customer is fixed and determinable as specifically outlined in the sales contract.
		·		For customers to whom credit terms are extended, the Group assesses a number of factors to determine whether collection from the customers is reasonably assured, including past transaction history with these customers and their credit-worthiness. All credit extended to customers is pre-approved by management. If the Group determines that collection is not reasonably assured, including cases where the customers retain a portion of the full contract price as retainage after a specific period, it defers the recognition of revenue until such criterion is met, which is generally upon receipt of payment.
		(ii)		Revenue recognition for solar products processing
	The Group provides solar products processing services to customers with their own wafer/polysilicon supplies. Under certain of these solar products processing service arrangements, the Group purchases raw materials from a customer and agrees to sell a specified quantity of solar products produced from such materials back to the same customer. The Group records revenue from these processing transactions on a net basis, recording revenue based on the amount received for solar products sold less the amount paid for the raw materials purchased from the customer.
		(iii)		Revenue recognition for engineering, procurement and construction services
	The Group recognizes revenue using the percentage of completion method for systems integration projects for which the Group provides engineering, procurement and construction (“EPC”) services under the EPC contracts. The Group estimates its revenues by using the cost-to-cost method, whereby it derives a ratio by comparing the costs incurred to date to the total costs expected to be incurred on the project. The Group applies the ratio computed in the cost-to-cost analysis to the contract price to determine the estimated revenues earned in each period. The Group uses this method because management considers costs incurred to be the best available measure of progress on these contracts and management believes it has the ability to reasonably estimate and track costs. When the Group determines that total estimated costs will exceed total revenues under a contract, it records a loss accordingly. No contract losses were recorded in the years ended December 31, 2012, 2013 and 2014. In the situation where payments under the EPC contracts to be received from the customer depend on the customer’s financing from other parties, revenue is recognized only when payments are received and other revenue recognition criteria are met. When EPC revenue is deferred as a result of not meeting all the revenue recognition criteria, the Group assesses whether related costs incurred can be deferred by considering recoverability of costs taken into consideration of contract terms and other relevant factors.
Cost of revenue	q)Cost of revenue
	Cost of revenue — solar products
	Cost of revenue for solar products includes production related direct labor, direct material cost , depreciation and amortization, indirect costs, shipping (freight in) and handling costs for products sold, inventory obsolescence and lower of cost or market charge, capacity underutilization charges and warranty cost. .
	Cost of revenue - solar products processing
	Cost of revenue for solar products processing includes direct labor, depreciation and amortization, indirect costs, and shipping and handling costs.
	Cost of revenue - engineering, procurement and construction services
	Costs of revenue for engineering, procurement and construction services include all direct material, labor, subcontractor cost, and those indirect costs related to contract performance, such as indirect labor, supplies and tools. The Group recognizes job material costs as incurred costs when the job materials have been installed. The Group considers job materials to be installed materials when they are permanently attached or fitted to the solar power systems as required by the engineering design.
Project assets	r)Project assets
	Project assets consist primarily of direct costs relating to solar power projects in various stages of development. A project asset is initially recorded at the actual cost. For a self-developed project asset that is initially obtained by application of feed-in-tariff (“FIT”) contract and other required permits, consents, the actual cost capitalized is the amount of the expenditure incurred for the application of those contracts, permits, consents, material and labor costs, capitalized interest and other similar direct costs. For a project asset acquired from external parties, the initial cost is the acquisition cost which includes the consideration transferred and certain direct acquisition cost. Modules cost, equipment cost and development and others incurred in the project development process will build up the cost of project assets.
			As of December 31,		As of December 31,
			2013		2014
			RMB		RMB
	Project assets-Modules cost		39,341		325,640
	Project assets-Equipment cost		—		128,805
	Project assets-Development and Others		8,405		197,049
	Total Project assets		47,746		651,494
	The Company reviews project assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. In determining whether or not the project assets are recoverable, the Company considers a number of factors, including changes in environmental, ecological, permitting, marketing price or regulatory conditions that affect the project. Such changes may cause the cost of the project to increase or the selling price of the project to decrease. No impairment of the project assets was recorded in the years ended December 31, 2013 and 2014.
	Costs capitalized in the construction of solar power plants under development will be transferred to solar power plants upon completion and when they are ready for its intended use, which is at the point when the solar power plant is connected to grids and begins to generate electricity. Depreciation of the completed solar power plant commences once the solar power plant is ready for its intended use. Depreciation will be computed using the straight-line method over the expected life. As of December 31, 2014, no solar power plant of the Company is ready for its intended use.
	As of December 31, 2014, project assets with net book value of RMB 310,029 were pledged as collateral for the Group’s borrowings of RMB 200,000 from Industrial and Commercial Bank of China.
Share based compensation	s)Share based compensation
	In accordance with ASC 718, Compensation-Stock Compensation, the Group measures the cost of employee services received in exchange for share-based compensation at the grant date fair value of the award.
	The Group recognizes the share-based compensation costs, net of a forfeiture rate, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards.
	ASC 718 requires forfeitures to be estimated at the time of grant and revised in subsequent periods if actual forfeitures differ from those estimates.
Research and development	t)Research and development
	Research and development costs are expensed when incurred.
Advertising expenses	u)Advertising expenses
	Advertising expenses are expensed when incurred. Advertising expenses are not significant during any of the periods covered by these consolidated financial statements.
Warranty cost	v)Warranty cost
	Solar modules produced by the Group are typically sold with a 10-year guarantee for defects in materials and workmanship and a 10-year and 25-year warranty against declines of more than 10.0% and 20.0%, respectively, of the initial minimum power generation capacity at the time of delivery. The Group therefore maintains warranty reserves (recorded as accrued warranty costs) to cover potential liabilities that could arise from these guarantees and warranties. The potential liability is generally in the form of product replacement or repair. The Group accrues 1.0% of its net revenues attributable to module sales as warranty costs at the time revenues are recognized and include that amount in its cost of revenues. Due to limited warranty claim history, the Group accrues the estimated costs of warranties based on its own history, industry data and an assessment of its competitors’ accrual history. Through the Group’s relationships with, and its management’s experience working at, other solar power companies and on the basis of publicly available information regarding other solar power companies’ accrued warranty costs, the Group believes that accruing 1.0% of its net revenues attributable to module sales as warranty costs is within the range of industry practice and is consistent with industry-standard accelerated testing, which assists the Group in estimating the long-term reliability of solar modules, estimates of failure rates from its quality review and other assumptions that it believes to be reasonable under the circumstances. However, although the Group conducts quality testing and inspection of its solar module products, these products have not been and cannot be tested in an environment simulating the up to 25-year warranty periods. Actual warranty costs are accumulated and charged against the accrued warranty liability. To the extent that the actual warranty costs differ from the estimates, the Group will prospectively revise its accrual rate.
Foreign currencies translation	w)Foreign currencies translation
	The functional and reporting currency of the Company and the majority of its subsidiaries is Renminbi (“RMB”). Transactions denominated in other currencies are translated into RMB at the exchange rates quoted by the People’s Bank of China (the “PBOC”)  prevailing when the transactions occur. Monetary assets and liabilities denominated in other currencies are translated into RMB at rates of exchange in effect at the balance sheet dates. All exchange gains and losses are included in the Consolidated Statements of Operations and Comprehensive (Loss)/Income as a separate line item after income/(loss) from operations.
	For the Company’s subsidiaries whose functional currency is not RMB, the asset and liability accounts are translated into RMB, its reporting currency, using exchange rates in effect at the balance sheet dates, equity accounts are translated at historical exchange rates, and income and expense items are translated using average exchange rates. Translation adjustments are reported as cumulative translation adjustments and are shown as a separate component of accumulative other comprehensive income, net of tax, in the Consolidated Statements of Operations and Comprehensive (Loss)/Income.
Segment reporting	x)Segment reporting
	The Group has adopted ASC 280, Segment Reporting, for its segment reporting. The Group operates and manages its business as a single segment. The Group’s chief decision-maker (“CODM”), which is identified as the Chief Executive Officer, reviews operating results to make decision about allocating resources and assessing performance for the entire company.
Commitments and Contingencies	y)Commitments and Contingencies
	Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated.
Earnings/(loss) per share	z)Earnings/(loss) per share
	In accordance with ASC 260, Earnings Per Share, basic earnings/(loss) per share is computed by dividing net income/(loss) attributable to ordinary shareholders by the weighted average number of ordinary shares outstanding during the year. Under the two-class method, net income is allocated between ordinary shares and other participating securities (i.e. warrants) based on their participating rights. Diluted earnings/(loss) per share is calculated by dividing net income/(loss) attributable to ordinary shareholders, as adjusted for the change in income or loss resulting from the assumed conversion of those participating securities, if any, by the weighted average number of ordinary shares and dilutive ordinary share equivalents outstanding during the year. Ordinary share equivalents consist of the ordinary shares issuable upon the conversion of the senior convertible notes (using the if-converted method) and ordinary shares issuable upon the exercise of outstanding share options and RSUs (using the treasury stock method). Potential dilutive securities are not included in the calculation of dilutive earnings per share if the effect is anti-dilutive.
Other Comprehensive income/ (loss)	aa)Other Comprehensive income/(loss)
	The Group has adopted ASC 220, Comprehensive Income. ASC 220 defines other comprehensive income/(loss) to include all changes in equity, including adjustments to minimum pension liabilities, accumulated foreign currency translation, unrealized gains or losses on available-for-sale marketable securities, and unrealized hedging gain/(loss) to the extent effective, except those resulting from investments by owners and distributions to owners.
Accounting for share lending arrangement	ab)Accounting for share lending arrangement
	The Company accounts for share lending arrangement in accordance with ASU 2009-15, Accounting for Own-Share Lending Arrangements in Contemplation of Convertible Debt Issuance or Other Financing, which requires an entity that enters into an equity-classified share lending agreement, utilizing its own shares, in contemplation of a convertible debt issuance or other financing to initially measure the share lending arrangement at fair value and treat it as a cost of the financing. In addition, if it becomes probable that the counterparty to the arrangement will default, the issuer shall recognize an expense for the fair value of the unreturned shares, net of probable recoveries.
Share repurchase	ac)Share repurchase
	When the shares are repurchased for retirement, the excess of cost over par value is charged entirely to retain earnings.
Recent accounting pronouncements	ad)Recent accounting pronouncements
	In April 2014, the FASB issued Accounting Standards Update No. 2014-08 ‘‘Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity’’. The new guidance changes the criteria for reporting discontinued operations while enhancing disclosures in this area. Under the new guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. Additionally, ASU 2014-08 requires expanded disclosures about discontinued operations that will provide financial statement users with more information about the assets, liabilities, income, and expenses of discontinued operations. The new guidance also requires disclosure of the pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. ASU 2014-08 is effective for the Company in the first quarter of fiscal 2015. Early adoption is permitted, but only for disposals (or classifications as held for sale) that have not been reported in financial statements previously issued or available for issuance. The Group is in the process of evaluating the impact of the standard on its consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09 (‘‘ASU 2014-09’’), ‘‘Revenue from Contracts with Customers (Topic 606)’’.  ASU 2014-09 will eliminate transaction-specific and industry-specific revenue recognition guidance under current U.S. GAAP and replace it with a principle-based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. Entities can transition to the standard either retrospectively or as a cumulative effect adjustment as of the date of adoption. The Group is in the process of evaluating the impact of the standard on its consolidated financial statements.

ORGANIZATION_AND_PRINCIPAL_ACT1

ORGANIZATION AND PRINCIPAL ACTIVITIES (Tables)	12 Months Ended
	Dec. 31, 2014
ORGANIZATION AND PRINCIPAL ACTIVITIES
Schedule of percentage ownership in subsidiaries	As of December 31, 2014, the Company’s principal subsidiaries include the following entities:
		Date of Incorporation/Acquisition	Place of	Percentage
			Incorporation	of Ownership
	JingAo Solar Co., Ltd. (“JA Hebei”)	May 18, 2005	PRC	100	%
	JA Development Co., Ltd. (“JA BVI”)	July 6, 2006	BVI	100	%
	Shanghai JA Solar Technology Co., Ltd. (“JA Fengxian”)	November 16, 2006	PRC	100	%
	JA Solar USA Inc. (“JA USA”)	April 13, 2007	USA	100	%
	Shanghai JA Solar PV Technology Co., Ltd. (“JA Zhabei”)	June 22, 2007	PRC	100	%
	JA Solar Technology Yangzhou Co., Ltd. (“JA Yangzhou”)	November 19, 2007	PRC	100	%
	JA Solar Hong Kong Limited (“JA Hong Kong”)	December 10, 2007	Hong Kong	100	%
	Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. (“JA Lianyungang”)	October 11, 2008	PRC	100	%
	JA Yangzhou PV Technology Co., Ltd. (“JA Yangzhou PV”)	November 23, 2009	PRC	100	%
	JA Solar GmbH (“JA GmbH”)	February 17, 2010	Germany	100	%
	Shanghai Jinglong Solar Technology Co., Ltd. (“JA Jinglong”)	July 5, 2010	PRC	100	%
	Donghai JA Solar Technology Co., Ltd. (“JA Wafer R&D”)	November 4, 2010	PRC	100	%
	JA (Hefei) Renewable Energy Co., Ltd. (“JA Hefei Renewable Energy”)	March 30, 2011	PRC	100	%
	Hefei JA Solar Technology Co., Ltd. (“JA Hefei Technology”)	July 8, 2011	PRC	100	%
	JA Solar Investment China Co., Ltd (“JA Investment”)	October 31, 2011	PRC	100	%
	Silver Age Holdings Limited (“Siliver Age”)	November 30, 2011	BVI	100	%
	Full Shine Holdings Limited (“Full Shine”)	November 30, 2011	Hong Kong	100	%
	Solar Silicon Valley Electronic Science and Technology Co., Ltd. (“Solar Silicon Valley”)	November 30, 2011	PRC	100	%
	JA Solar Japan Limited (“JA Japan”)	July 12, 2012	Japan	100	%
	Dunhuang JA Solar Power Development Co., Ltd (“JA Dunhuang”)	July 23, 2012	PRC	100	%
	Hebei Ningjin Songgong Semiconductor Co., Ltd. (“Ningjin Songgong”)	January 29, 2013	PRC	65	%
	JA Solar Investment (Hong Kong) Limited	May 16, 2013	Hong Kong	100	%
	JA Solar Australia PTY Limited	June 12, 2013	Australia	100	%
	JA Solar PV Technology Co., LTD	January 13, 2014	PRC	100	%
	JA Solar PV Electric (Shexian) Co,. Ltd	March 10, 2014	PRC	100	%
	Aiyouen Power Electric (Yinchuan) Co,. Ltd	March 25, 2014	PRC	65	%
	JA Solar PV Electric (Baotou) Co,. Ltd	March 26, 2014	PRC	100	%
	JA Solar Iriki Power Plant Limited	April 10, 2014	Japan	100	%
	Beijing JA Solar PV Technology Co., Ltd.	April 14, 2014	PRC	100	%
	JA Solar PV Electric (Huanghua) Co,. Ltd	July 1, 2014	PRC	100	%
	JA Powerway South Africa Proprietary Limited	July 5, 2014	South Africa	65	%
	JA Solar PV Electric (Yanchi) Co,. Ltd	July 17, 2014	PRC	100	%
	JA New Energy Development (Hebei) Co., Ltd.	August 25, 2014	PRC	100	%
	JA Solar PV Electric (Juxian) Co,. Ltd	August 26, 2014	PRC	100	%
	2432243 Ontario Corp	September 1, 2014	Canada	100	%
	JA Solar PV Electric (Chifeng) Co,. Ltd	October 20, 2014	PRC	100	%
	JA Solar PV Electric (Wulanchabu) Co,. Ltd	November 12, 2014	PRC	100	%
	JA New Energy (Xilinhaote) Co,. Ltd .	December 4, 2014	PRC	100	%
	JA Solar Malaysia Sdn. Bhd.	December 10, 2014	Malaysia	100	%
	JA Solar PV Electric (LaiWu) Co,. Ltd	December 30, 2014	PRC	100	%

Summary_of_significant_account2

Summary of significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2014
Summary of significant accounting policies
Schedule of estimated useful lives of assets
	Buildings	20 years
	Leasehold improvements	Shorter of the lease term or their estimated useful lives
	Machinery and equipment	5-15 years
	Furniture and fixtures	5 years
	Motor vehicles	5 years
Schedule of projects asset
			As of December 31,	As of December 31,
			2013	2014
			RMB	RMB
	Project assets-Modules cost		39,341	325,640
	Project assets-Equipment cost		—	128,805
	Project assets-Development and Others		8,405	197,049
	Total Project assets		47,746	651,494

Acquisition_Tables

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2014
Summary of unaudited pro forma results of operations
			Year ended		Year ended
			December 31,		December 31,
			2012		2013
			RMB		RMB
			(Unaudited)		(Unaudited)
	Pro forma revenue		6,845,610		7,197,985
	Pro forma net loss		(1,727,001	)	(425,155	)
	Pro forma loss attributable to holders of common shares		(1,687,720	)	(428,005	)
	Pro forma loss per share:
	Basic		(8.66	)	(2.13	)
	Diluted		(8.66	)	(2.13	)
	Weighted average number of shares used in computation:
	Basic		194,788,429		201,317,884
	Diluted		194,788,429		201,317,884
Ningjin Songgong
Schedule of acquired assets and liabilities based on their estimated fair values at acquisition date
			As of January 31, 2013(1)
			RMB
	Assets acquired:
	Cash and cash equivalents		45,109
	Accounts receivable		138,516
	Short term prepayment		18,221
	Inventory		75,473
	Other current assets		34,702
	Long term prepayment		18,826
	Property, plant and equipment, net (2)		69,785
	Total assets acquired		400,632
	Liabilities
	Short-term borrowings		24,100
	Accounts payable		45,822
	Other payables		57,376
	Payroll and welfare payable		41,244
	Accrued expenses		578
	Total liabilities assumed		169,120
	Total fair value of net assets		231,512
	Less: Non-controlling interest		81,029
	Fair value of purchase consideration		150,483
		-1		The acquisition was completed on January 29, 2013. Considering the nominal financial impact of the two days from January 30 to January 31, 2013, we used January 31, 2013 as the acquisition date and the fair value assessment was made based on the financial information as of January 31, 2013.
		-2		The fair value of property, plant and equipment was recognized and measured at fair value using discounted future cash flow method.  Accumulated depreciation was not carried forward.
JA MEMC
Schedule of acquired assets and liabilities based on their estimated fair values at acquisition date
			As of June 24, 2014
			RMB
	Assets acquired:
	Cash and cash equivalents		8,426
	Other current assets		13,260
	Property, plant and equipment, net (1)		83,025
	Total assets acquired		104,711
	Liabilities
	Accounts payable		697
	Other liabilities		2
	Total liabilities assumed		699
	Total fair value of net assets		104,012
		-1		The fair value of property, plant and equipment was recognized and measured at fair value using discounted future cash flow method.  Accumulated depreciation was not carried forward.

Accounts_Receivable_net_Tables

Accounts Receivable, net (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts Receivable, net
Schedule of allowance for doubtful accounts
		As of December 31,		As of December 31,		As of December 31,
		2012		2013		2014
		RMB		RMB		RMB
	Balance at beginning of the year	32,591		189,971		280,987
	Allowance made during the year	200,446		125,691		71,104
	Recoveries	(13,316	)	(34,675	)	(55,721	)
	Amount written off against the allowance	(29,750	)	—		(20,844	)
	Balance at end of the year	189,971		280,987		275,526

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventories
Schedule of inventory
		As of December 31,	As of December 31,
		2013	2014
		RMB	RMB
	Raw materials	522,302	603,110
	Work-in-progress	71,676	130,055
	Finished goods	753,116	1,153,103
	Total	1,347,094	1,886,268

Advances_to_suppliers_Tables

Advances to suppliers (Tables)	12 Months Ended
	Dec. 31, 2014
Advances to suppliers
Schedule of outstanding prepayments, net of any allowance to individual suppliers in excess of 10% of total prepayments to suppliers
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Supplier A (third party)	602,109		440,342
	Supplier B (third party)	174,278		134,035
Schedule of allowance for advances to supplier
		As of December		As of December		As of December
		31,		31,		31,
		2012		2013		2014
		RMB		RMB		RMB
	Balance at beginning of the year	94,154		158,452		72,327
	Allowance made during the year*	103,139		10,392		63,331
	Recoveries	(38,841	)	—		(6,351	)
	Written off	—		(96,517	)	—
	Balance at end of the year	158,452		72,327		129,307
	* Although currently the Company is still in the process of renegotiating with Supplier D, such process has been slowed down due to uncertainties related to anti-dumping and anti-subsidy investigation and ruling. As of December 31, 2014, full provision of RMB 63,331 was provided against the prepayment made to Supplier D under the long-term supply contract, as management could not conclude that such amount is recoverable. On March 31st, 2015, the Company received a termination notice from supplier D. (Refer to Note 26 Contingencies and Commitments)

Other_current_assets_Tables

Other current assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other current assets
Schedule of other current assets
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Input value-added tax recoverable	330,482	434,209
	Income tax recoverable	47,819	—
	Value-added tax refund from export sales	31,670	150,911
	Prepaid input VAT & customs duty for import machinery and materials	14,226	21,700
	Prepaid expenses	12,311	12,184
	Foreign exchange forward contract instruments	237	5,540
	Accounts receivable recovery from insurance companies	15,059	—
	Deposit receivable	51,798	49,303
	Current portion of land use rights	10,063	10,063
	Others	22,469	29,853
		536,134	713,763

Property_plant_and_equipment_n1

Property, plant and equipment, net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, plant and equipment, net
Schedule of property, plant and equipment
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Buildings	1,255,743		1,482,046
	Furniture, fixtures and office equipment	83,745		92,175
	Motor vehicles	26,318		29,550
	Machinery and equipment	4,220,860		4,705,592
	Leasehold improvements	141,289		151,959
	Total	5,727,955		6,461,322
	Less: accumulated depreciation	(2,209,955	)	(2,759,096	)
	Subtotal	3,518,000		3,702,226
	Construction-in-progress	640,108		464,521
	Property, plant and equipment, net	4,158,108		4,166,747

Intangible_assets_net_Tables

Intangible assets, net (Tables)	12 Months Ended
	Dec. 31, 2014
Intangible assets, net
Summary of intangible assets
		Gross	Accumulated		Net
			Amortization
		RMB	RMB		RMB
	As of December 31, 2013
	Technical know-how	9,000	(9,000	)	—
	Customer relationship	3,191	(1,329	)	1,862
	Purchased software and others	23,941	(11,380	)	12,561
		36,132	(21,709	)	14,423
	As of December 31, 2014
	Technical know-how	9,000	(9,000	)	—
	Customer relationship	3,191	(1,968	)	1,223
	Purchased software and others	24,673	(13,168	)	11,505
		36,864	(24,136	)	12,728

Income_taxes_Tables

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income taxes
Schedule of tax benefit/(expense)
			For the year		For the year		For the year
			ended		ended		ended
			December 31,		December 31,		December 31,
			2012		2013		2014
	Current tax		(101,975	)	(13,462	)	(189,622	)
	Deferred tax		1,350		28,489		116,232
			(100,625	)	15,027		(73,390	)
Schedule of components of deferred tax assets
			As of December		As of December
			31,		31,
			2013		2014
			RMB		RMB
	Deferred tax assets:
	Temporary differences:
	Pre-operating expenses		92		—
	Amortization of intangible assets		1,232		1,135
	Accrued warranty costs		28,510		49,309
	Accrued expenses		23,746		25,438
	Net loss carried forward		395,477		229,859
	Depreciation of property, plant and equipment		86,997		103,758
	Inventory write-down and idle capacity charges		13,322		9,813
	Allowance for doubtful accounts		69,199		66,991
	Allowance for advance to suppliers		10,397		18,665
	Impairment loss on property, plant and equipment		156,483		103,195
	Loss for equity investment in a joint venture		4,967		—
	Accrued interest		13,209		27,279
	Government grant for the acquisition of land use rights and property, plant and equipment		8,379		44,057
	Timing difference for revenue recognition of retainage contract		21,726		32,746
	Others		4,047		18,704
	Deferred tax assets		837,783		730,949
	Deferred tax liabilities:
	Temporary differences:
	Capitalized interest		(31,983	)	(35,333	)
	Deferred tax liabilities		(31,983	)	(35,333	)
	Less: valuation allowance		(683,341	)	(456,925	)
	Deferred tax assets-net		122,459		238,691
	Deferred tax assets are analyzed as:
			As of December		As of December
			31,		31,
			2013		2014
			RMB		RMB
	Current		64,409		90,169
	Non-Current		90,033		183,855
			154,442		274,024
	Deferred tax liability are analyzed as:
	Current		—		—
	Non-Current		-31,983		(35,333	)
			-31,983		(35,333	)
			122,459		238,691
Schedule of movement of the valuation allowance for deferred tax assets
			As of December		As of December 31,		As of December
			31,				31,
			2012		2013		2014
			RMB		RMB		RMB
	Balance at beginning of the year		202,235		576,541		683,341
	Business combination		—		63,873		—
	Allowance made during the year		374,306		158,904		40,619
	Reversals and utilization		—		(115,977	)	(267,035	)
	Balance at end of the year		576,541		683,341		456,925
Schedule of reconciliation between provision for income tax
			For the year		For the year		For the year
			ended		ended		ended
			December 31,		December 31,		December 31,
			2012		2013		2014
	PRC enterprise income tax		(25	)%	(25	)%	25	%
	Effect of permanent differences:
	Share based compensation and other permanent difference		5.62	%	4.03	%	4.50	%
	Effect of tax holiday and tax differential of certain subsidiaries (1)		(2.10	)%	8.17	%	(8.43	)%
	Effect of tax rate change (2)		(2.69	)%	(0.32	)%	24.30	%
	Additional tax for previously approved tax holiday		5.29	%	—	%	—	%
	Withholding tax for dividend distribution		1.35	%	—	%	—	%
	Intra-group investment disposal income subject to tax		—		—		12.28	%
	Valuation allowance		23.97	%	9.72	%	(43.54	)%
			6.44	%	(3.40	)%	14.11	%
		-1		Effect of tax holiday and tax differential of certain subsidiaries increased from 8.17% to 8.43%, mainly due to fair value gain generated in 2014 by JA Cayman related to warrants, which are not subject to tax on income or capital gain.
		-2		Change of tax rate increased from (0.32%) in 2013 to 24.30% in 2014 is due to the different enacted tax rate used in the calculation of deferred tax assets in 2014 for one subsidiary to reflect the decrease of tax rate, which resulted in the reduction of previously disclosed deferred tax asset benefit (gross amount). Deferred tax assets for this subsidiary have been fully provided for valuation allowance in both 2014 and 2013. The corresponding reversal of valuation allowance has been included in the line of valuation allowance.
Schedule of aggregate amount and per share effect of tax holiday
			For the year		For the year		For the year
			ended		ended		ended
			December 31,		December 31,		December 31,
			2012		2013		2014
	The aggregate dollar effect		—		10,540		43,405
	Per share effect-basic		—		0.05		0.18
	Per share effect-diluted		—		0.05		0.18

Prepaid_land_use_rights_Tables

Prepaid land use rights (Tables)	12 Months Ended
	Dec. 31, 2014
Prepaid land use rights
Schedule of prepayment for land use rights
		As of December		As of December
		31,		31,
		2013		2014
		RMB		RMB
	Cost	491,638		491,638
	Less: accumulated amortization	(32,956	)	(43,019	)
	Net book value	458,682		448,619
	Current portion of prepaid land use rights (recorded in other current assets)	10,063		10,063
	Non-current portion of prepaid land use rights	448,619		438,556
	Total	458,682		448,619

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Borrowings
Schedule of borrowings
	Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
				RMB)
	As of December 31, 2013
	Short-term loan:
	Bank of China	September 2013	September 2014	200,000	Quarterly
	Agriculture Bank of China	September 2013	September 2014	80,000	Monthly
	Agriculture Bank of China	September 2013	January 2014	34,379	Together with principal
	Agriculture Bank of China	September 2013	February 2014	79,248	Together with principal
	Agriculture Bank of China	November 2013	April 2014	539	Together with principal
	Agriculture Bank of China	December 2013	May 2014	3,073	Together with principal
	Agriculture Bank of China	December 2013	April 2014	95,721	Monthly
	Agriculture Bank of China	December 2013	May 2014	2,038	Together with principal
	Agriculture Bank of China	December 2013	May 2014	1,996	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	September 2013	March 2014	10,000	Together with principal
	China Merchant Bank	December 2013	June 2014	30,000	Together with principal
	Huaxia Bank	May 2013	February 2014	40,000	Together with principal
	Huaxia Bank	February 2013	February 2014	10,000	Together with principal
	Bank of Communication	August 2013	February 2014	42,000	Monthly
	Hefei S & T Rural Commercial Bank	March 2013	March 2014	150,000	Quarterly
	Hefei S & T Rural Commercial Bank	April 2013	March 2014	50,000	Quarterly
	Rural Credit Cooperative of Hebei	March 2013	March 2014	28,000	Monthly
	Bank of Xingtai	June 2013	June 2014	20,000	Monthly
	Bank of Xingtai	July 2013	June 2014	40,000	Monthly
	OCBC Bank	March 2013	April 2014	30,485	Monthly
	OCBC Bank	May 2013	May 2014	54,873	Monthly
	Other loan *	April 2013	March 2014	30,000	Quarterly
	Other loan*	November 2013	November 2014	50,000	Quarterly
	Subtotal			1,122,352
	*Local government provided short-term loan to one subsidiary located in Jiangsu Province with market interest rate bearing.
	Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment
				RMB)	Periods
	Long-term loan due in one year:
	China Construction Bank	May 2012	April 2014	157,000	Monthly
	China Construction Bank	June 2012	May 2014	34,000	Monthly
	Industrial and Commercial Bank of China	December 2011	November 2014	150,000	Monthly
	Bank of Xingtai	September 2012	September 2014	100,000	Monthly
	Industrial and Commercial Bank of China	March 2011	March 2014	140,000	Monthly
	Industrial and Commercial Bank of China	April 2011	March 2014	40,000	Monthly
	Industrial and Commercial Bank of China	May 2011	March 2014	20,000	Monthly
	Industrial and Commercial Bank of China	June 2011	June 2014	15,917	Monthly
	Industrial and Commercial Bank of China	December 2011	June 2014	57,246	Monthly
	China Everbright Bank	June 2011	June 2014	200,000	Quarterly
	Agriculture Bank of China	August 2012	February 2014	2,850	Quarterly
	Agriculture Bank of China	September 2012	February 2014	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2014	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2014	8,150	Quarterly
	Subtotal			936,163
	Short-term borrowings and current portion of long term borrowings			2,058,515
	Long-term loan:
	Industrial and Commercial Bank of China	June 2011	January 2019	720,000	Annually
	Industrial and Commercial Bank of China	June 2011	January 2018	432,000	Annually
	Industrial and Commercial Bank of China	June 2011	January 2017	288,000	Annually
	Agriculture Bank of China	September 2012	February 2015	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2015	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2015	8,150	Quarterly
	Agriculture Bank of China	August 2012	February 2016	2,850	Quarterly
	Agriculture Bank of China	September 2012	February 2016	8,150	Quarterly
	Agriculture Bank of China	August 2012	August 2016	2,850	Quarterly
	Agriculture Bank of China	September 2012	August 2016	8,150	Quarterly
Agriculture Bank of China	August 2012	February 2015	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2017	2,850	Quarterly
Agriculture Bank of China	September 2012	February 2017	8,150	Quarterly
Agriculture Bank of China	August 2012	August 2017	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2017	8,150	Quarterly
Agriculture Bank of China	August 2012	February 2018	2,850	Quarterly
Agriculture Bank of China	September 2012	February 2018	8,150	Quarterly
Agriculture Bank of China	August 2012	August 2018	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2019	10,100	Quarterly
Agriculture Bank of China	August 2012	February 2019	2,900	Quarterly
Agriculture Bank of China	August 2012	August 2019	2,900	Quarterly
Agriculture Bank of China	September 2012	August 2019	10,100	Quarterly
Subtotal			1,554,000
Total borrowings			3,612,515
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of December 31, 2014
Short-term loan:
Industrial and Commercial Bank of China	April 2014	March 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	October 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	June 2015	50,000	Monthly
Industrial and Commercial Bank of China	May 2014	April 2015	50,000	Monthly
Industrial and Commercial Bank of China	December 2014	June 2015	58,131	Monthly
Bank of Communication	January 2014	January 2015	50,000	Monthly
Bank of Communication	August 2014	February 2015	97,904	Together with principal
Huaxia Bank	March 2014	March 2015	30,000	Monthly
Huaxia Bank	April 2014	April 2015	20,000	Monthly
Huaxia Bank	May 2014	March 2015	30,000	Monthly
China Merchant Bank	October 2014	April 2015	62,000	Together with principal
China Merchant Bank	November 2014	May 2015	28,759	Together with principal
China Merchant Bank	September 2014	March 2015	48,952	Together with principal
China Merchant Bank	December 2014	June 2015	30,000	Together with principal
China Merchant Bank	December 2014	June 2015	32,400	Together with principal
China Construction Bank	April 2014	April 2015	48,500	Monthly
China Construction Bank	April 2014	April 2015	100,000	Monthly
China Construction Bank	April 2014	April 2015	11,500	Monthly
China Construction Bank	May 2014	May 2015	34,000	Monthly
China Construction Bank	November 2014	May 2015	48,789	Monthly
China Construction Bank	November 2014	May 2015	22,171	Monthly
Bank of China	June 2014	June 2015	200,000	Quarterly
Bank of China	September 2014	March 2015	34,849	Monthly
Bank of China	October 2014	April 2015	35,490	Monthly
Industrial and Commercial Bank of China	December 2014	November 2015	150,000	Monthly
Agriculture Bank of China	May 2014	May 2015	20,000	Monthly
Agriculture Bank of China	March 2014	March 2015	76,363	Monthly
Agriculture Bank of China	January 2014	January 2015	50,000	Monthly
Agriculture Bank of China	February 2014	February 2015	30,000	Monthly
Agriculture Bank of China	August 2014	January 2015	3,139	Together with principal
Agriculture Bank of China	August 2014	February 2015	66,746	Together with principal
Agriculture Bank of China	August 2014	January 2015	3,625	Together with principal
Agriculture Bank of China	August 2014	February 2015	38,418	Together with principal
Agriculture Bank of China	August 2014	January 2015	2,889	Together with principal
Agriculture Bank of China	September 2014	January 2015	3,429	Together with principal
Agriculture Bank of China	September 2014	March 2015	12,116	Together with principal
Agriculture Bank of China	September 2014	February 2015	3,483	Together with principal
Agriculture Bank of China	September 2014	March 2015	14,935	Together with principal
Agriculture Bank of China	September 2014	February 2015	74,040	Together with principal
Agriculture Bank of China	September 2014	February 2015	3,299	Together with principal
Agriculture Bank of China	October 2014	March 2015	2,288	Together with principal
Agriculture Bank of China	October 2014	March 2015	1,212	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,966	Together with principal
Agriculture Bank of China	October 2014	March 2015	2,472	Together with principal
Agriculture Bank of China	October 2014	March 2015	3,209	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,439	Together with principal
Agriculture Bank of China	November 2014	April 2015	1,955	Together with principal
Agriculture Bank of China	December 2014	April 2015	2,956	Together with principal
Agriculture Bank of China	December 2014	May 2015	1,457	Together with principal
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of December 31, 2014
Short-term loan(continued):
Agriculture Bank of China	December 2014	May 2015	2,988	Together with principal
Agriculture Bank of China	December 2014	May 2015	2,084	Together with principal
Bank of Xingtai	September 2014	September 2015	2,000	Monthly
Bank of Xingtai	September 2014	March 2015	1,000	Monthly
Industrial Bank Co., Ltd.	April 2014	April 2015	140,000	Quarterly
Bank of Xingtai	June 2014	June 2015	60,000	Monthly
Hefei S & T Rural Commercial Bank	June 2014	May 2015	100,000	Quarterly
Hefei S & T Rural Commercial Bank	June 2014	May 2015	100,000	Quarterly
Rural Credit Cooperative of Hebei	March 2014	March 2015	28,000	Monthly
Bank of Xingtai	September 2014	March 2015	100	Monthly
Bank of Xingtai	September 2014	September 2015	200	Monthly
Bank of Xingtai	September 2014	March 2015	100	Monthly
Bank of Xingtai	September 2014	September 2015	200	Monthly
Shanghai Pudong Development Bank	August 2014	August 2015	39,980	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2015	2,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2015	2,000	Quarterly
Subtotal			2,275,533
Long-term loan due in one year:
Agriculture Bank of China	August 2012	February 2015	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2015	2,850	Quarterly
Agriculture Bank of China	September 2012	August 2015	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2015	8,150	Quarterly
Subtotal			22,000
Short-term borrowings and current portion of long term borrowings			2,297,533
Long-term loan:
Agriculture Bank of China	June 2014	June 2016	80,000	Monthly
Bank of Xingtai	September 2014	September 2016	74,000	Monthly
Bank of Xingtai	September 2014	March 2016	3,000	Monthly
Bank of Xingtai	September 2014	March 2016	300	Monthly
Bank of Xingtai	September 2014	September 2016	8,400	Monthly
Bank of Xingtai	September 2014	March 2016	300	Monthly
Bank of Xingtai	September 2014	September 2016	8,400	Monthly
Industrial and Commercial Bank of China	July 2014	January 2017	288,000	Annually
Industrial and Commercial Bank of China	July 2014	January 2018	300,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	168,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	300,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2018	132,000	Annually
Industrial and Commercial Bank of China	August 2014	January 2019	252,000	Annually
Industrial and Commercial Bank of China	December 2014	May 2016	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2016	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2017	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2017	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2018	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2018	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2019	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2019	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2020	7,000	Quarterly
Lender	Date of Borrowing	Due Date	Principal Amount ( in	Interest Payment Periods
			RMB)
As of Decemberember 31, 2014
Long term loan(continued):
Industrial and Commercial Bank of China	December 2014	November 2020	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2021	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2021	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2022	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2022	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2023	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2023	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2024	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2024	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2025	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2025	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2026	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2026	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2027	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2027	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2028	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	November 2028	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	May 2029	7,000	Quarterly
Industrial and Commercial Bank of China	December 2014	December 2029	7,000	Quarterly
Agriculture Bank of China	August 2012	February 2017	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2018	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2019	2,900	Quarterly
Agriculture Bank of China	August 2012	February 2016	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2016	2,850	Quarterly
Agriculture Bank of China	August 2012	August 2017	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2018	2,850	Quarterly
Agriculture Bank of China	August 2012	February 2019	2,900	Quarterly
Agriculture Bank of China	September 2012	February 2016	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2016	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2017	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2017	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	August 2018	8,150	Quarterly
Agriculture Bank of China	September 2012	February 2019	10,100	Quarterly
Agriculture Bank of China	September 2012	August 2019	10,100	Quarterly
Subtotal			1,902,400
Total borrowings			4,199,933
Schedule of borrowings by current and noncurrent classification
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Short-term	1,122,352	2,275,533
	Long-term, current portion	936,163	22,000
	Subtotal	2,058,515	2,297,533
	Long-term	1,554,000	1,902,400
	Total	3,612,515	4,199,933
Schedule of future principal repayments on the long-term borrowings
	Year ending December 31,	RMB
	2015	22,000
	2016	210,400
	2017	324,000
	2018	468,000
	Thereafter	900,000
	Total	1,924,400

Other_payables_to_third_partie1

Other payables to third parties (Tables)	12 Months Ended
	Dec. 31, 2014
Other payables to third parties
Schedule of other payables to third parties
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Payables for purchase of property, plant and equipment	221,232	195,069
	Payables for project assets	—	134,667
	Payables for land use rights	35,000	33,000
	Miscellaneous tax payables	18,253	34,033
	Deposits	5,433	21,679
	Labor services payables	11,959	8,634
	Logistic charges	28,422	48,132
	Payable to staff *	52,732	—
	Interest	88,060	181,857
	Others	21,179	36,300
	Total other payables	482,270	693,371
	*Amount due to employees related to short term borrowings from employees at an average interest rate of 9%.

Accrued_expenses_Tables

Accrued expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued expenses
Schedule of accrued expenses
		As of December	As of December
		31,	31,
		2013	2014
		RMB	RMB
	Professional service fees	10,659	19,885
	Interest	107,611	47,250
	Utilities	2,685	2,109
	Logistic charges	11,153	23,738
	Tax	12,740	16,159
	Others	21,206	38,153
	Total accrued expenses	166,054	147,294

Accrued_warranty_cost_Tables

Accrued warranty cost (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued warranty cost
Summary of movement of Group's accrued warranty costs for solar module
		As of December		As of December	As of December
		31,		31,	31,
		2012		2013	2014
		RMB		RMB	RMB
	Beginning balance	78,751		114,226	158,897
	Warranty provision	42,167		44,671	92,843
	Warranty utilization	(6,692	)	—	—
	Ending balance	114,226		158,897	251,740

Sharebased_compensation_Tables

Share-based compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based compensation
Schedule of fair value assumptions for options granted to employees
			For the year ended		For the year ended	For the year ended
			December 31, 2012		December 31, 2013	December 31, 2014
	Average risk-free rate		1.09%~1.27%		—	1.80%~2.01%
	Weighted average expected option life		5.75 years		—	6 years
	Volatility rate		80.5	%	—	56.22%~100.06%
	Dividend		—		—	—
		-1		The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected life of the awards in effect at the time of grant.
		-2		The average expected option life is based on the contractual term of the option and expected employee exercise and post-vesting employment termination behavior. Currently, it is based on the simplified approach.
		-3		The Company has no history or expectation of paying dividends on its ordinary shares.
		-4		The Company chose to use the historical volatility and implied volatility of a basket of comparable publicly-traded companies for a period equal to the expected term preceding the grant date.
Schedule of information with respect to share options outstanding
			Shares		Weighted	Weighted	Intrinsic
					Average	Average	Value (US$,
					Exercise	Remaining	in thousands)
					Price (US$)	Contractual Life
						(Year)
	Outstanding at December 31, 2011		2,690,650		6.71	7.17	—
	Granted		2,207,000		1.4
	Forfeited		(540,600	)	4.6
	Exercised		—		—
	Outstanding at December 31, 2012		4,357,050		4.28	7.62	—
	Granted		—
	Forfeited		(1,373,750	)	1.37
	Exercised		(401,750	)	1.37
	Outstanding at December 31, 2013		2,581,550		4.79	6.4	612
	Granted		3,660,000		1.88
	Forfeited		(296,500	)	2.21
	Exercised		(268,750	)	1.37
	Outstanding at December 31, 2014		5,676,300		3.21	7.59	279
	Exercisable at December 31, 2014		2,261,300		5.23	5.19	273
Schedule of information with respect to RSUs outstanding
			Shares		Weighted Average
					Fair Value (US$)
	Nonvested at December 31, 2011		2,493,000		5.17
	Granted		90,000		0.79
	Vested		(95,000	)	5.92
	Forfeited		(50,000	)	5.85
	Nonvested at December 31, 2012		2,438,000		4.97
	Granted		—		—
	Vested		(1,281,890	)	5.04
	Forfeited		(140,000	)	4.28
	Nonvested at December 31, 2013		1,016,110		4.95
	Granted		90,000		1.99
	Vested		(85,000	)	5.11
	Forfeited		(62,500	)	5.52
	Nonvested at December 31, 2014		958,610		4.62

Foreign_currency_forward_contr1

Foreign currency forward contracts (Tables)	12 Months Ended
	Dec. 31, 2014
Foreign currency forward contracts
Schedule of outstanding notional balances and the estimated fair value of the Group's foreign-currency forward exchange contracts
		As of December 31,	As of December 31,	As of December 31,	As of December 31,
		2013	2013	2014	2014
		RMB	RMB	RMB	RMB
		Notional Amount	Estimate fair value	Notional Amount	Estimate fair value
	Foreign exchange forward contracts not designated as hedging instruments, recorded in other current assets	93,295	237	192,201	5,541

Mainland_China_contribution_pl1

Mainland China contribution plan and profit appropriation (Tables)	12 Months Ended
	Dec. 31, 2014
Mainland China contribution plan and profit appropriation
Schedule of paid-in capital amounts unavailable for distribution as nominal dividends
	Legal Entity	Paid-in Capital
		restricted
	JingAo Solar Co., Ltd.	RMB 1,000,000
	Shanghai JA Solar Technology Co., Ltd.	USD 80,000
	Shanghai JA Solar PV Technology Co., Ltd.	USD 20,000
	JA Solar Technology Yangzhou Co., Ltd.	USD 260,000
	Jing  Hai  Yang  Semiconductor  Materials  (Donghai)  Co., Ltd.	USD 98,000
	JA Yangzhou PV Technology Co., Ltd.	USD 10,000
	Shanghai Jinglong Solar Technology Co., Ltd.	RMB 180,000
	Donghai JA Solar Technology Co., Ltd.	RMB 50,000
	JA (Hefei) Renewable Energy Co., Ltd.	USD 15,000
	Hefei JA Solar Technology Co., Ltd.	RMB 1,440,000
	Solar Silicon Valley Electronic Science and Technology Co., Ltd.	USD 36,986
	JA Solar Investment (China) Co., Ltd.	USD 40,000
	Dunhuang JA Solar Power Development Co., Ltd	RMB 254,000
	Hebei Ningjin Songgong Semiconductor Co., Ltd.	RMB 275,000
	JA Solar PV Technology Co., LTD	USD 10,000
	JA Solar PV Electric (Shexian) Co,. Ltd	RMB 3,000
	Aiyouen Power Electric (Yinchuan) Co,. Ltd	RMB 26,000
	JA Solar PV Electric (Baotou) Co,. Ltd	RMB 2,000
	Beijing JA Solar PV Technology Co., Ltd.	RMB 20,000
	JA Solar PV Electric (Huanghua) Co,. Ltd	RMB 1,000
	JA Solar PV Electric (Yanchi) Co,. Ltd	RMB 4,000
	JA New Energy Development (Hebei) Co., Ltd.	RMB 1,000

Earnings_loss_per_share_Tables

Earnings (loss) per share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings (loss) per share
Schedule of basic and diluted net (loss)/earnings per share
			Year ended		Year ended		Year ended
			December 31,		December 31,		December 31,
			2012		2013		2014
			RMB		RMB		RMB
	Numerator:
	Net (loss)/income attributable to JA Solar Holdings		(1,662,257	)	(429,280	)	423,771
	Fair value of warrants in excess of net proceeds of equity offering		—		(44,396	)	—
	Allocation of net income to participating warrant holder		—		—		(77,174	)
	Numerator for basic (loss)/earnings per share		(1,662,257	)	(473,676	)	346,597
	Dilutive effect of:
	Add back allocation to participating warrant holder (1)						4,336
	Excluding portion of fair value gain (2)						(16,716	)
	Numerator for diluted earnings per share		(1,662,257	)	(473,676	)	334,217
	Denominator:
	Denominator for basic loss per share - weighted average ordinary shares outstanding		194,788,429		201,317,884		242,192,859
	Dilutive effect of share options and RSUs*		—		—		363,633
	Dilutive effect of warrants*		—		—		306,592
	Denominator for diluted loss per share		194,788,429		201,317,884		242,863,084
	Basic (loss)/earnings per share		(8.53	)	(2.35	)	1.43
	Diluted (loss)/earnings per share		(8.53	)	(2.35	)	1.38
		-1		Net income has been adjusted to participating Series A-3 Warrant and Series B Warrant holder based on their respective rights to share in dividends in 2014.
		-2		The fair value gain represents the change in fair value of Series A-3 Warrant, which is deducted from income (numerator) in calculating diluted earnings per share. Series A-3 Warrant has dilutive effect as its exercise price of US$ 9.43 per ADS is less than average stock price during the period it was outstanding.
	*. These potentially dilutive share options, RSUs and convertible notes totaling 5,628,371 in 2012 were not included in the calculation of dilutive earnings per share in 2012 because of their anti-dilutive effect.
	* These potentially dilutive share options and RSUs totaling 3,433,109 in 2013 were not included in the calculation of dilutive earnings per share in 2013 because of their anti-dilutive effect.
	* These potentially dilutive warrants 30,806,670 in 2013 were not included in the calculation of dilutive earnings per share in 2013 because of their anti-dilutive effect.
	* These potentially dilutive share options and RSUs totaling 2,856,278 in 2014 were not included in the calculation of dilutive earnings per share in 2014 because of their anti-dilutive effect.
	* These potentially dilutive warrants 52,569,971 in 2014 were not included in the calculation of dilutive earnings per share in 2014 because of their anti-dilutive effect. Series B Warrant is anti-dilutive as the exercise price of US$ 10. 90 per ADS is higher than average stock price during the year.

Related_party_transactions_Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related party transactions
Schedule of balances due to related parties
		As of December 31,	As of December 31,
		2013	2014
		RMB	RMB
	Short-term:
	Payables to Hebei Jinglong Industry and Commerce Group Co., Ltd. (“Hebei Jinglong”)	13,462	8,040
	Payables to Jing Wei Electronics Co., Ltd.(“Jing Wei”)	97,648	84,020
	Payables to Xingtai Jinglong Electronics and Materials Co., Ltd.(“Xingtai Jinglong”)	60,807	63,633
	Payables to Heibei Ningjin Songgong Electronics Co., Ltd. (“Songgong Electronics”)	37,456	17,302
	Payables to Yangguang Guifeng Electronics Co., Ltd.(“Yangguang Guifeng”)	55,965	88,757
	Payables to Ningjin Saimei Ganglong Electronics Co., Ltd. (“Saimei Ganglong”)	—	34,821
	Payables to Hebei Jinglong Fine Chemical Co., Ltd. (“Fine Chemical”)	—	24,827
	Others	61,552	17,917
	Total amounts due to related parties	326,890	339,317
Schedule of balances due from related parties
		As of December 31,	As of December 31,
		2013	2014
		RMB	RMB
	Short-term:
	Advance to related party suppliers, net
	Advances to Hebei Jinglong	113,000	60,000
	Accounts receivable from related party customers, net
	Receivables from JA Solar PV Electric (Lincheng) Co,. Ltd. (“Lin Cheng”)	—	109,407
	Receivables from Hebei Jinglong	65,567	106,194
	Receivables from Jing Wei	72,510	28,194
	Receivables from Xingtai Jinglong	58,750	19,694
	Receivables from Songgong Electronics	38,598	67,243
	Receivables from Yangguang Guifeng	44,266	40,726
	Receivables from others-short term	16,006	10,818
	Amount due from related parties:
	Loan to Yangzhou JA Property Co., Ltd. (“Yangzhou Property”)	40,000	40,000
	Amount due from others-short term	3,436	7,890
	Long-term:
	Advances to Hebei Jinglong-long term	603	10,145
	Total amounts due from related parties	452,736	500,311
Schedule of sales of products to related parties
		For the year ended	For the year ended	For the year ended
		December 31, 2012	December 31, 2013	December 31, 2014
		RMB	RMB	RMB
	Sales of products
	Subsidiaries of Hebei Jinglong	172,623	394,974	73,215
	Ningjin Songgong	67,393	1,531	—
	Others	3,204	—	115,382
	Total	243,220	396,505	188,597
	Purchase of products
	Subsidiaries of Hebei Jinglong	464,511	609,635	1,079,882
	Ningjin Songgong	350,685	35,504	—
	Others	12,515	—	—
	Total	827,711	645,139	1,079,882
	Processing service
	Subsidiaries of Hebei Jinglong	19,086	7,124	14,735
	Others	7,618	—	—
	Total	26,704	7,124	14,735
	Purchase of equipment and building
	Subsidiaries of Hebei Jinglong	2,481	1,967	2,543
	Yangzhou Property	—	—	77,398
	Total	2,481	1,967	79,941
	Sales of equipment
	Subsidiaries of Hebei Jinglong	—	5,000	—
	Total	—	5,000	—
	Provide entrusted loan
	Yangzhou Property	—	40,000	40,000
	Total	—	40,000	40,000
	Provide Guarantee
	Yangzhou Property	—	20,000	—
	Total	—	20,000	—
	Receive Guarantee
	Hebei Jinglong	—	228,000	672,047
	Yangzhou Property	—	50,000	80,000
	Total	—	278,000	752,047

Contingencies_and_Commitments_

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Contingencies and Commitments
Schedule of future obligations
		“Take or pay”	Other	Total
		supply	Multi-year
		agreements	supply
			agreements *
		(in RMB)	(in RMB)	(in RMB)
	Twelve Months Ending December 31
	2015	2,674,655	299,788	2,974,443
	2016	1,634,874	382,227	2,017,101
	2017	1,598,344	—	1,598,344
	2018	1,561,813	—	1,561,813
	2019	1,525,283	—	1,525,283
	Thereafter	761,816	—	761,816
	Total	9,756,785	682,015	10,438,800
	* includes only purchase commitments with fixed or minimum price provisions.
Schedule of future minimum obligations for operating leases
		(in RMB)
	2015	65,387
	2016	41,751
	2017	1,790
	2018	—
	Thereafter	—
	Total	108,928

Fair_value_measurements_Tables

Fair value measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair value measurements
Schedule of information about inputs into the fair value measurements of the Group's assets and liabilities that are measured at fair value on a recurring basis in periods subsequent to their initial recognition
		Fair Value Measurements at Reporting Date Using
	Description	Balance as of		Quoted Prices in		Significant Other	Significant
		31 December		Active Markets		Observable Inputs	Unobservable
		2013		for Identical		(Level 2)	Inputs
				Assets (Level 1)			(Level 3)
	Assets:
	Foreign exchange forward contract instruments	237		—		237	—
	Liabilities:
	Derivatives liabilities - warrants	(185,365	)				(185,365	)
		Fair Value Measurements at Reporting Date Using
	Description	Balance as of		Quoted Prices in		Significant Other	Significant
		31 December		Active Markets		Observable Inputs	Unobservable
		2014		for Identical		(Level 2)	Inputs
				Assets (Level 1)			(Level 3)
	Assets:
	Foreign exchange forward contract instruments	5,541		—		5,541	—
	Liabilities:
	Derivatives liabilities - warrants	(105,785	)				(105,785	)
Summary of changes in fair value of assets and liabilities using significant unobservable inputs (Level 3 valuation)
	Balance at December 31, 2012	—
	Fair value balance as of Aug. 13, 2013	(172,916	)
	Unrealized gain included in change in fair value of warrant derivatives	(51,074	)
	Exercise of warrants reclassified to additional paid –in capital	35,701
	Exchange gain	2,924
	Balance at December 31, 2013	(185,365	)
	Balance at December 31, 2013	(185,365	)
	Unrealized gain included in change in fair value of warrant derivatives	74,014
	Exercise of warrants reclassified to additional paid –in capital	6,343
	Exchange gain	(777	)
	Balance at December 31, 2014	(105,785	)
Schedule of information about inputs into the fair value measurements of the Group's assets that are measured at fair value on a non-recurring basis in periods subsequent to their initial recognition
		Fair Value Measurements at Reporting Date Using
	Description	Balance as of		Quoted Prices in		Significant Other	Significant		Total
		31 December		Active Markets		Observable Inputs	Unobservable		(losses)
		2012		for Identical		(Level 2)	Inputs
				Assets (Level 1)			(Level 3)
	Assets:
	Long-lived assets	515,854		—		—	515,854		(397,789	)
	Investment in a joint venture	50,910		—		—	50,910		(38,000	)
Schedule of changes in fair value of derivatives
		For the year ended		For the year ended		For the year ended
		December 31, 2012		December 31, 2013		December 31, 2014
	Embedded derivatives underlying convertible notes	32		—		—
	Derivatives liabilities - warrants	—		(51,074	)	74,014
	Foreign exchange forward contracts not designated as hedging instruments	9,302		(793	)	10,470
		9,334		(51,867	)	84,484

Segment_information_Tables

Segment information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment information
Schedule of Group's net revenue generated from different geographic locations
		Year Ended December 31,
		2012	2013	2014
		RMB	RMB	RMB
	China	3,086,589	3,001,498	3,741,732
	Outside China:
	Germany	1,265,827	660,589	202,315
	Japan	436,443	1,596,703	3,852,572
	Rest of the world	1,930,206	1,923,999	3,498,904
	Total outside China	3,632,476	4,181,291	7,553,791
	Total net revenue	6,719,065	7,182,789	11,295,523

Additional_information_condens1

Additional information - condensed financial statements of the Company (Tables)	12 Months Ended
	Dec. 31, 2014
Additional information - condensed financial statements of the Company
Condensed Statement of Operations
		For the year		For the year		For the year
		ended		ended		ended
		December 31,		December 31,		December 31,
		2012		2013		2014
		RMB		RMB		RMB
	Revenues	—		—		—
	Total operating expenses	(22,576	)	(24,368	)	(38,940	)
	Loss from operations	(22,576	)	(24,368	)	(38,940	)
	Interest expense	(192,618	)	(47,330	)	—
	Change in fair value of derivatives	32		(51,074	)	74,014
	Share of (loss)/income from subsidiaries	(1,809,926	)	(246,909	)	380,263
	Convertible bond buyback loss	(8,466	)	—		—
	Other income/(loss)	371,297		(59,599	)	8,434
	Income/(loss) before income taxes	(1,662,257	)	(429,280	)	423,771
	Net (loss)/income	(1,662,257	)	(429,280	)	423,771
	Less: fair value of warrants in excess of net proceeds of equity offering	—		44,396		—
	Net (loss)/income attributable to JA Solar Holdings	(1,662,257	)	(473,676	)	423,771
Condensed Statement of Financial Position
		December 31,		December 31,
		2013		2014
		RMB		RMB
	ASSETS
	Current assets:
	Cash and cash equivalents	34,293		29,223
	Other receivable from subsidiaries	244,772		—
	Other current assets	3,631		2,257
	Total current assets	282,696		31,480
	Investments in subsidiaries	2,579,236		2,978,282
	Amount due from subsidiaries	2,557,138		2,566,506
	Total assets	5,419,070		5,576,268
	LIABILITIES AND SHAREHOLDERS’ EQUITY
	Current liabilities:
	Other payables to subsidiaries and employees	7,788		6,364
	Accrued and other liabilities	3,611		11,454
	Derivatives liabilities - warrants	31,106		105,785
	Total current liabilities	42,505		123,603
	Long-term amount due to subsidiaries	602,044		92,493
	Derivatives liabilities - warrants	154,259		—
	Total liabilities	798,808		216,096
	Commitments and Contingencies
	Shareholders’ equity  :
	Ordinary shares (US$0.0001 par value; 500,000,000 shares authorized, 227,499,837 and 252,301,917 shares issued and outstanding as of December 31, 2013 and December 31, 2014)	170		186
	Additional paid-in capital	5,327,177		5,638,703
	Accumulated deficit	(713,574	)	(289,803	)
	Accumulated other comprehensive income	6,489		11,086
	Total shareholders’ equity	4,620,262		5,360,172
	Total liabilities and shareholders’ equity	5,419,070		5,576,268
Condensed Statement of Cash Flows
		For the year		For the year		For the year
		ended December		ended December		ended December
		31, 2012		31, 2013		31, 2014
		RMB		RMB		RMB
	Cash flows from operating activities:
	Net (loss)/Income	(1,662,257	)	(429,280	)	423,771
	Adjustments to reconcile net loss to net cash used in operating activities:
	Share-based compensation expense	2,055		1,960		4,985
	Share of (loss)/income from subsidiaries	1,809,926		246,909		(380,263	)
	Amortization of deferred issuance cost and increase in accretion of convertible notes	135,725		35,030		—
	Change in the fair value of derivatives	(32	)	51,074		(74,014	)
	Exchange loss/(income)	4,422		85,032		(11,636	)
	Loss from senior convertible notes buyback	8,466		—		—
	Gain from sales of claim against loaned shares	(369,153	)	—		—
	Changes in operating assets and liabilities:
	Decrease/(increase) in other current assets	(3,227	)	1,651		1,374
	Increase/(decrease) in other payables to subsidiaries and employees	—		1,216		(1,424	)
	(Decrease)/increase in accrued and other liabilities	(33,728	)	(10,978	)	7,843
	Decrease in interest payable	(3,746	)	(4,123	)	—
	Net cash used in operating activities	(111,549	)	(21,509	)	(29,364	)
	Cash flows from investing activities:
	Loans granted to subsidiaries	(12,349	)	—		—
	Loans repayment by subsidiaries	125,710		133,458		244,772
	Net cash provided by investing activities	113,361		133,458		244,772
	Cash flows from financing activities:
	Proceeds from long-term loan from subsidiaries	211,193		623,759		—
	Repurchase of senior convertible notes	(617,937	)	(740,027	)	—
	Proceeds from sales of claim against loaned shares	369,153		—		—
	Proceeds from issuance of ordinary shares	—		128,529		—
	Proceeds from issuance of ordinary shares upon exercise of warrants	—		143,107		286,747
	Repurchase of ADS	(15,276	)	—		—
	Repayment of long-term loan from subsidiaries	(12,571	)	(253,629	)	(509,571	)
	Proceeds from exercise of stock options	—		3,389		2,171
	Net cash provided by/(used in) financing activities	(65,438	)	(94,872	)	(220,653	)
	Effect of exchange rate changes on cash and cash equivalents	3,628		205		175
	Net (decrease)/increase in cash and cash equivalents	(59,998	)	17,282		(5,070	)
	Cash and cash equivalents at the beginning of the year	77,009		17,011		34,293
	Cash and cash equivalents at the end of the year	17,011		34,293		29,223

ORGANIZATION_AND_PRINCIPAL_ACT2

ORGANIZATION AND PRINCIPAL ACTIVITIES (Details)	1 Months Ended
	Jan. 31, 2013	Dec. 31, 2014	Nov. 30, 2011	Jun. 30, 2014
JA Hebei
Organizational and principal activities
Percentage of Ownership		100.00%
JA BVI
Organizational and principal activities
Percentage of Ownership		100.00%
Shanghai JA Solar Technology Co., Ltd. ("JA Fengxian")
Organizational and principal activities
Percentage of Ownership		100.00%
JA USA
Organizational and principal activities
Percentage of Ownership		100.00%
Shanghai JA Solar PV Technology Co., Ltd. ("JA Zhabei")
Organizational and principal activities
Percentage of Ownership		100.00%
JA Yangzhou
Organizational and principal activities
Percentage of Ownership		100.00%
JA Hong Kong
Organizational and principal activities
Percentage of Ownership		100.00%
Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. ("JA Lianyungang")
Organizational and principal activities
Percentage of Ownership		100.00%
JA Yangzhou PV Technology Co., Ltd. ("JA Yangzhou PV")
Organizational and principal activities
Percentage of Ownership		100.00%
JA GmbH
Organizational and principal activities
Percentage of Ownership		100.00%
Shanghai Jinglong Solar Technology Co., Ltd. ("JA Jinglong")
Organizational and principal activities
Percentage of Ownership		100.00%
Donghai JA Solar Technology Co., Ltd. ("JA Wafer R&D")
Organizational and principal activities
Percentage of Ownership		100.00%
JA (Hefei) Renewable Energy Co., Ltd. ("JA Hefei Renewable Energy")
Organizational and principal activities
Percentage of Ownership		100.00%
JA Hebei
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar Investment China Co., Ltd ("JA Investment")
Organizational and principal activities
Percentage of Ownership		100.00%
Silver Age
Organizational and principal activities
Percentage of Ownership		100.00%
Full Shine
Organizational and principal activities
Percentage of Ownership		100.00%
Solar Silicon Valley Electronic Science and Technology Co., Ltd. ("Solar Silicon Valley")
Organizational and principal activities
Percentage of Ownership		100.00%
JA Japan
Organizational and principal activities
Percentage of Ownership		100.00%
Dunhuang JA Solar Power Development Co., Ltd ("JA Dunhuang")
Organizational and principal activities
Percentage of Ownership		100.00%
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Organizational and principal activities
Percentage of Ownership		65.00%
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong") | M.SETEK
Organizational and principal activities
Equity interest acquired (as a percent)	65.00%
JA Solar Investment (Hong Kong) Limited
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar Australia PTY Limited
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Technology Co., LTD
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (Shexian) Co,. Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
Aiyouen Power Electric (Yinchuan) Company Limited
Organizational and principal activities
Percentage of Ownership		65.00%
JA Solar PV Electric (Baotou) Company Limited
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar Iriki Power Plant Limited
Organizational and principal activities
Percentage of Ownership		100.00%
Beijing JA Solar PV Technology Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (Huanghua) Co,. Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Powerway South Africa Proprietary Limited
Organizational and principal activities
Percentage of Ownership		65.00%
JA Solar PV Electric (Yanchi) Co,. Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA New Energy Development (Hebei) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (Juxian) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
2432243 Ontario Corp
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (Chifeng) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (Wulanchabu) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA New Energy (Xilinhaote) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar Malaysia Sdn. Bhd
Organizational and principal activities
Percentage of Ownership		100.00%
JA Solar PV Electric (LaiWu) Co., Ltd
Organizational and principal activities
Percentage of Ownership		100.00%
Lincheng JA PV Power Generation Co., Ltd.
Organizational and principal activities
Percentage of Ownership		100.00%
Silver Age
Organizational and principal activities
Percentage of equity interest acquired			100.00%
Full Shine
Organizational and principal activities
Percentage of equity interest acquired			100.00%
Solar Silicon Valley Electronic Science and Technology Co., Ltd. ("Solar Silicon Valley")
Organizational and principal activities
Percentage of equity interest acquired			100.00%
JA MEMC
Organizational and principal activities
Percentage of interest acquired				50.00%

Summary_of_significant_account3

Summary of significant accounting policies (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	Buildings	Machinery and equipment	Machinery and equipment	Furniture and fixtures	Motor vehicles
								Minimum	Maximum
Cash, cash equivalents and restricted cash
Maximum original maturity period of all highly liquid investments to be considered as cash equivalents	3 months	3 months
Inventories
Loss provision recorded related to fixed price polysilicon purchase agreements	$0	0	$0	0	$0	0
Short-term and long-term advances to suppliers
Period of expected purchases used to determine classification of advances to suppliers	12 months	12 months
Property and equipment, net
Estimated useful lives							20 years	5 years	15 years	5 years	5 years

Summary_of_significant_account4

Summary of significant accounting policies (Details 2)

12 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

USD ($)

CNY

USD ($)

CNY

USD ($)

Industrial and Commercial Bank of China

Minimum

Maximum

Technical know-how

Customer relationship

Purchased software and others

Purchased software and others

CNY

component

Minimum

Maximum

shareholder

Intangible assets, net

Number of shareholders contributing technical know-how related to the commercial production process of photovoltaic solar cells

1

Number of components of technical know-how related to the commercial production process of photovoltaic solar cells

1

Useful life

8 years

5 years

3 years

10 years

Prepaid land use rights

Land use rights, lease term

40 years

50 years

Income taxes

Percentage of likelihood of realization of recognized tax benefit

50.00%

50.00%

Uncertain tax positions

$0

$0

$0

Revenue recognition

Contract loss related to engineering, procurement and construction services

0

0

0

Project assets

Project assets - Modules cost

325,640

39,341

Project assets - Equipment cost

128,805

Project assets - Development and Others

197,049

8,405

Total Project assets

651,494

47,746

Impairment of project assets

0

0

Net book value of project assets pledged as collateral

310,029

Bank loans secured by pledge of project assets

200,000

Summary_of_significant_account5

Summary of significant accounting policies (Details 3)	12 Months Ended
	Dec. 31, 2014
Warranty cost
Guarantee for defects in materials and workmanship	10 years
Warranty period of solar modules against decline of more than 10% of initial power generation capacity	10 years
Warranty period of solar modules against decline of more than 20% of initial power generation capacity	25 years
Minimum percentage of decline in initial minimum power generation capacity for 10 years	10.00%
Minimum percentage of decline in initial minimum power generation capacity for 25 years	20.00%
Warranty accrual rate as a percent of solar module revenue	1.00%

Acquisition_Details

Acquisition (Details) (CNY)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jan. 29, 2013	Dec. 31, 2013	Mar. 08, 2012
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Acquisition of Hebei Ningjin Songgong
Fair value amount of equity interest in subsidiary to be transferred by supplier			247,000
Third party individuals | Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Acquisition of Hebei Ningjin Songgong
Ownership percentage held			2.30%
Mr. Baofang Jin | Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Acquisition of Hebei Ningjin Songgong
Ownership percentage held			32.70%
M.SETEK
Acquisition of Hebei Ningjin Songgong
Portion of prepayment to be repaid by supplier in supply of inventory			128,687
M.SETEK | Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Acquisition of Hebei Ningjin Songgong
Ownership percentage held			65.00%
Portion of prepayment to be repaid by supplier in cash			69,500
Impairment of allowance for advance to third party suppliers		96,517
Ownership percentage transferred	65.00%
Total consideration received by supplier on transfer of equity interest	150,483

Acquisition_Details_2

Acquisition (Details 2) (CNY)	12 Months Ended			0 Months Ended	11 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Dec. 31, 2013
Liabilities
Net revenues	11,295,523	7,182,789	6,719,065
Net loss	346,597	-473,676	-1,662,257
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Assets acquired:
Cash and cash equivalents				45,109
Accounts receivable				138,516
Short term prepayment				18,221
Inventory				75,473
Other current assets				34,702
Property, plant and equipment, net				69,785
Long term prepayment				18,826
Total assets acquired				400,632
Liabilities
Short-term borrowings				24,100
Accounts payable				45,822
Other payables				57,376
Payroll and welfare payable				41,244
Accrued expenses				578
Total liabilities assumed				169,120
Total fair value of net assets				231,512
Less: Non-controlling interest				81,029
Fair value of purchase consideration				150,483
Net revenues					158,179
Net loss					5,178

Acquisition_Details_3

Acquisition (Details 3) (Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong"), CNY)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Acquisition of Hebei Ningjin Songgong
Pro forma revenue	7,197,985	6,845,610
Pro forma net loss	-425,155	-1,727,001
Pro forma loss attributable to holders of common shares	-428,005	-1,687,720
Pro forma loss per share:
Basic (in dollars per share)	-2.13	-8.66
Diluted (in dollars per share)	-2.13	-8.66
Weighted average number of shares used in computation:
Basic (in shares)	201,317,884	194,788,429
Diluted (in shares)	201,317,884	194,788,429
Amount included in unaudited pro forma net loss for the reduction of depreciation expenses of property, plant and equipment	17,236	17,236

Acquisition_Details_4

Acquisition (Details 4)	12 Months Ended			1 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Jun. 24, 2014
	CNY	CNY	CNY	JA MEMC	JA MEMC	JA MEMC	JA MEMC
				USD ($)	CNY	CNY	CNY
Acquisition of JA MEMC
Equity interest acquired (as a percent)				50.00%	50.00%
Cash consideration				$7,700	47,400
Equity interest previously owned (in percent)				50.00%	50.00%
Revaluation gain						3,652
Negative goodwill	4,628					4,628
Assets acquired:
Cash and cash equivalents							8,426
Other current assets							13,260
Property, plant and equipment, net							83,025
Total assets acquired							104,711
Liabilities
Accounts payable							697
Other liabilities							2
Total liabilities assumed							699
Total fair value of net assets							104,012
Net revenues	11,295,523	7,182,789	6,719,065			40,996
Total revenue percentage						0.40%
Net loss	346,597	-473,676	-1,662,257

Investments_in_joint_venture_a1

Investments in joint venture and affiliates (Details) (CNY)	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011	Dec. 31, 2014	Mar. 31, 2014	Jul. 31, 2014
Investment in a joint venture
Loss/(income) for equity investment in a joint venture	441,000	2,108,000	43,501,000
Investments in subsidiaries	13,524,000	48,802,000			13,524,000
Share of loss/(income) from subsidiaries	-441,000	-2,108,000	-43,501,000
JA MEMC
Investment in a joint venture
Loss/(income) for equity investment in a joint venture	441,000	2,108,000	5,501,000
Other-than-temporary impairment charge	0	0	38,000,000
Percentage of interest acquired						50.00%
Share of loss/(income) from subsidiaries	-441,000	-2,108,000	-5,501,000
JA MEMC | JA Yangzhou
Investment in a joint venture
Capital contribution to joint venture				96,211,000
Ownership in joint venture (as a percent)				50.00%
Lincheng
Investment in a joint venture
Ownership in joint venture (as a percent)		100.00%					20.00%
Contribution to capital injection	16,600,000
Investments in subsidiaries	13,500,000				13,500,000
Modules sold					115,400,000
Cost of modules sold					100,000,000
Share of unrealized profit (in percent)					20.00%
Share of unrealized profit					3,100,000
Lincheng | Rich Energy
Investment in a joint venture
Ownership in joint venture (as a percent)							80.00%
Contribution to capital injection	66,400,000

Notes_Receivable_Details

Notes Receivable (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Notes Receivable
Maximum maturity period of notes receivable	6 months
Allowance for notes receivable	$0	$0

Accounts_Receivable_net_Detail

Accounts Receivable, net (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement of allowances
Provision, net of recoveries	15,383	91,016	187,130
Allowance for doubtful accounts
Movement of allowances
Balance at beginning of the year	280,987	189,971	32,591
Allowance made during the year	71,104	125,691	200,446
Recoveries	-55,721	-34,675	-13,316
Amount written off against the allowance	-20,844		-29,750
Balance at end of the year	275,526	280,987	189,971

Accounts_Receivable_net_Detail1

Accounts Receivable, net (Details 2)	12 Months Ended
	Dec. 31, 2014
Solar cells
Creditworthiness of customers
Maximum term of credit for customers with good credit-worthiness	90 days
Solar modules
Creditworthiness of customers
Maximum term of credit for customers with good credit-worthiness	180 days

Inventories_Details

Inventories (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	Vendor D	Vendor D
							CNY	CNY
Raw materials		603,110		522,302
Work-in-progress		130,055		71,676
Finished goods		1,153,103		753,116
Total		1,886,268		1,347,094
Inventory written down expense		15,073		119,936		171,165
Loss provision recorded related to fixed price polysilicon purchase agreements	$0	0	$0	0	$0	0	0	0
Maximum import tariffs (as a percent)	57.00%	57.00%

Advances_to_suppliers_Details

Advances to suppliers (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Advances to suppliers
Minimum period of advances to suppliers to classify them as non-current assets	12 months
Outstanding prepayments, net of any allowance to individual suppliers
Disclosure threshold (as a percent)		10.00%
Advances to suppliers | Supplier concentration risk
Outstanding prepayments, net of any allowance to individual suppliers
Disclosure threshold (as a percent)	10.00%		10.00%
Advances to suppliers | Supplier concentration risk | Supplier A (third party)
Outstanding prepayments, net of any allowance to individual suppliers
Outstanding prepayments	440,342		602,109
Advances to suppliers | Supplier concentration risk | Supplier C (third party)
Outstanding prepayments, net of any allowance to individual suppliers
Outstanding prepayments	134,035		174,278

Advances_to_suppliers_Details_

Advances to suppliers (Details 2) (Allowance for advances to supplier, CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for advances to supplier
Movement of allowances
Balance at beginning of the year	72,327	158,452	94,154
Allowance made during the year	63,331	10,392	103,139
Recoveries	-6,351		-38,841
Written off		96,517
Balance at end of the year	129,307	72,327	158,452

Other_current_assets_Details

Other current assets (Details) (CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other current assets
Input value-added tax recoverable	434,209	330,482
Income tax recoverable		47,819
Value-added tax refund from export sales	150,911	31,670
Prepaid input VAT & customs duty for import machinery and materials	21,700	14,226
Prepaid expenses	12,184	12,311
Foreign exchange forward contract instruments	5,540	237
Accounts receivable recovery from insurance companies		15,059
Deposit receivable	49,303	51,798
Current portion of land use rights	10,063	10,063
Others	29,853	22,469
Other current assets	713,763	536,134

Property_plant_and_equipment_n2

Property, plant and equipment, net (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment, net
Total	6,461,322	5,727,955
Less: accumulated depreciation	-2,759,096	-2,209,955
Subtotal	3,702,226	3,518,000
Construction-in-progress	464,521	640,108
Property and equipment, net	4,166,747	4,158,108
Interest capitalized	38,053	39,902	51,783
Impairment loss			397,789
Depreciation expense	672,855	580,157	646,955
Impairment loss related to retirement of long-lived assets	0	0
JA Hebei and JA Fengxian facilities
Property, plant and equipment, net
Impairment loss			147,092
Capacity of outdated solar cells and solar modules facilities (in mega watts)			300
Buildings
Property, plant and equipment, net
Total	1,482,046	1,255,743
Buildings | Agriculture Bank of China | Long-term loan
Property, plant and equipment, net
Net book value of assets pledged	218,603
Bank borrowing loan against asset	85,400
Buildings | Agriculture Bank of China | Short-term loans
Property, plant and equipment, net
Net book value of assets pledged	91,653
Bank borrowing loan against asset	140,000
Buildings | Shanghai Pudong Development Bank | Short-term loans
Property, plant and equipment, net
Net book value of assets pledged	116,192
Bank borrowing loan against asset	39,980
Furniture, fixtures and office equipment
Property, plant and equipment, net
Total	92,175	83,745
Motor vehicles
Property, plant and equipment, net
Total	29,550	26,318
Machinery and equipment
Property, plant and equipment, net
Total	4,705,592	4,220,860
Impairment loss	0	0	250,697
Leasehold improvements
Property, plant and equipment, net
Total	151,959	141,289
Buildings, machineries, equipment and construction in progress | Hefei High-Tech Industrial Development Zone Management Co., Ltd | Long-term loan
Property, plant and equipment, net
Net book value of assets pledged	834,341
Bank borrowing loan against asset	1,440,000

Intangible_assets_net_Details

Intangible assets, net (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible assets, net
Gross	36,864	36,132
Accumulated Amortization	-24,136	-21,709
Net	12,728	14,423
Amortization of acquired intangible assets	2,427	3,018	4,572
Future amortization expense
2015	2,046
2016	2,046
2017	2,046
2018	2,046
2019	2,046
Technical know-how
Intangible assets, net
Gross	9,000	9,000
Accumulated Amortization	-9,000	-9,000
Customer relationship
Intangible assets, net
Gross	3,191	3,191
Accumulated Amortization	-1,968	-1,329
Net	1,223	1,862
Purchased software and others
Intangible assets, net
Gross	24,673	23,941
Accumulated Amortization	-13,168	-11,380
Net	11,505	12,561

Income_taxes_Details

Income taxes (Details) (CNY)	12 Months Ended							0 Months Ended	12 Months Ended		36 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Mar. 16, 2007	Dec. 31, 2007	Dec. 31, 2006	Dec. 31, 2012	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2014
Income taxes
Preferential income tax rate as an ANTE		15.00%	15.00%	15.00%
Preferential income tax rate, renewal period	3 years
Withholding tax rate maximum on distribution of profits of FIEs (as a percent)		10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Withholding tax on appropriation of dividend for reinvestment purpose (as a percent)			10.00%
Withholding tax paid and recorded as income tax expenses			21,064
Cumulative undistributed earnings of the Company's PRC subsidiaries intended to be permanently reinvested	3,092,616	2,478,536											2,478,536		3,092,616
Amount of the unrecognized deferred tax liability on the permanently reinvested earnings	309,262	247,854											247,854		309,262
Uniform tax rate (as a percent)	25.00%	-25.00%	-25.00%
Tax benefit/(expense):
Current tax	-189,622	-13,462	-101,975
Deferred tax	116,232	28,489	1,350
Total	-73,390	15,027	-100,625
Temporary differences:
Pre-operating expenses		92											92
Amortization of intangible assets	1,135	1,232											1,232		1,135
Accrued warranty costs	49,309	28,510											28,510		49,309
Accrued expenses	25,438	23,746											23,746		25,438
Net loss carried forward	229,859	395,477											395,477		229,859
Depreciation of property, plant and equipment	103,758	86,997											86,997		103,758
Inventory write-down and idle capacity charges	9,813	13,322											13,322		9,813
Allowance for doubtful accounts	66,991	69,199											69,199		66,991
Allowance for advance to suppliers	18,665	10,397											10,397		18,665
Impairment loss on property, plant and equipment	103,195	156,483											156,483		103,195
Loss for equity investment in a joint venture		4,967											4,967
Accrued interest	27,279	13,209											13,209		27,279
Government grant for the acquisition of land use rights and property, plant and equipment	44,057	8,379											8,379		44,057
Timing difference for revenue recognition of retainage contract	32,746	21,726											21,726		32,746
Others	18,704	4,047											4,047		18,704
Deferred tax assets	730,949	837,783											837,783		730,949
Temporary differences:
Capitalized interest	-35,333	-31,983											-31,983		-35,333
Deferred tax liabilities	-35,333	-31,983											-31,983		-35,333
Less: valuation allowance	-456,925	-683,341											-683,341		-456,925
Deferred tax assets-net	238,691	122,459											122,459		238,691
Deferred tax assets are analyzed as:
Current	90,169	64,409											64,409		90,169
Non-Current	183,855	90,033											90,033		183,855
Total	274,024	154,442											154,442		274,024
Deferred tax liability are analyzed as:
Current	0														0
Non-Current	-35,333	-31,983											-31,983		-35,333
Deferred tax liabilities	-35,333	-31,983											-31,983		-35,333
Deferred tax assets-net	238,691	122,459											122,459		238,691
Hong Kong SAR
Income taxes
Uniform tax rate (as a percent)	16.50%
Tax benefit/(expense):
Total	0
United States
Income taxes
Uniform tax rate (as a percent)	35.00%
United States | California
Income taxes
State income tax rate (as a percent)	8.84%
Luxemburg
Income taxes
Uniform tax rate (as a percent)	29.22%
Germany
Income taxes
Uniform tax rate (as a percent)	15.00%
Effective income tax rate (as a percent)	29.55%
Solidarity surcharge tax rate (as a percent)	5.50%
Trade income tax rate (as a percent)	13.72%
Japan
Income taxes
Uniform tax rate (as a percent)	35.64%
Australia
Income taxes
Uniform tax rate (as a percent)	30.00%
Foreign-owned operating subsidiaries | China
Income taxes
Foreign state income tax rate (as a percent)									30.00%
Foreign local income tax rate (as a percent)									3.00%
Tax exemption period following first profit-making year									2 years
Reduction of FEIT for 3 years following exemption period (as a percent)									50.00%
Reduction of FEIT by 50% following exemption period									3 years
Tax reduction, required operational period more than									10 years
Uniform tax rate (as a percent)								25.00%
JA Hebei
Income taxes
Dividend declared			107,804								107,804
JA Hebei | China
Income taxes
Tax exemption period following first profit-making year									2 years	2 years
Reduction of FEIT for 3 years following exemption period (as a percent)					50.00%	50.00%	50.00%
Preferential income tax rate as an ANTE											15.00%
JA Hebei | China | Subsequent tax period
Income taxes
Preferential income tax rate as an ANTE												15.00%
JA Yangzhou | China
Income taxes
Preferential income tax rate as an ANTE													15.00%
Dividend declared			210,637								210,637
JA Yangzhou | China | Subsequent tax period
Income taxes
Preferential income tax rate as an ANTE														15.00%
Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. ("JA Lianyungang") | China
Income taxes
Preferential income tax rate as an ANTE													15.00%
Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. ("JA Lianyungang") | China | Subsequent tax period
Income taxes
Preferential income tax rate as an ANTE														15.00%
Shanghai JA Solar Technology Co., Ltd. ("JA Fengxian") | China
Income taxes
Preferential income tax rate as an ANTE													15.00%
Shanghai JA Solar Technology Co., Ltd. ("JA Fengxian") | China | Subsequent tax period
Income taxes
Preferential income tax rate as an ANTE														15.00%
Donghai JA Solar Technology Co., Ltd. ("JA Wafer R&D") | China | Subsequent tax period
Income taxes
Preferential income tax rate as an ANTE															15.00%

Income_taxes_Details_2

Income taxes (Details 2)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	USD ($)		Deferred tax assets	Deferred tax assets	Deferred tax assets
	item			CNY	CNY	CNY
Movement in valuation allowance
Balance at beginning of the year				683,341	576,541	202,235
Business combination					63,873
Allowance made during the year				40,619	158,904	374,306
Reversals and utilization				-267,035	-115,977
Balance at end of the year				456,925	683,341	576,541
PRC enterprise income tax (as a percent)	25.00%	-25.00%	-25.00%
Effect of permanent differences:
Share based compensation and other permanent difference (as a percent)	4.50%	4.03%	5.62%
Effect of tax holiday and tax differential of certain subsidiaries	-8.43%	8.17%	-2.10%
Effect of tax rate change (as a percent)	24.30%	-0.32%	-2.69%
Additional tax for previously approved tax holiday (as a percent)			5.29%
Withholding tax for dividend distribution (as a percent)			1.35%
Intra-group investment disposal income subject to tax	12.28%
Valuation allowance (as a percent)	-43.54%	9.72%	23.97%
Total (as a percent)	14.11%	-3.40%	6.44%
Number of subsidiaries resulted in decrease of tax rate	1
Aggregate amount and per share effect of tax holidays
The aggregate dollar effect	$43,405	$10,540
Per share effect-basic (in dollars per share)	$0.18	$0.05
Per share effect-diluted (in dollars per share)	$0.18	$0.05

Government_grant_Details

Government grant (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Government grant
Receipt of government grants related to property, plant and equipment and land use rights	45,300	126,900	78,020
Long-term liability balance related to government grants	278,272	262,348
Recognition of government grants	32,078	14,471	18,672
Amortization of government grants	27,376	13,290	9,002

Prepaid_land_use_rights_Detail

Prepaid land use rights (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Land use rights, minimum lease term	40 years
Land use rights, maximum lease term	50 years
Cost	491,638	491,638
Less: accumulated amortization	-43,019	-32,956
Current portion of prepaid land use rights (recorded in other current assets)	10,063	10,063
Non-current portion of prepaid land use rights	438,556	448,619
Net	448,619	458,682
Agriculture Bank of China
Debt Instrument [Line Items]
Bank loan secured by pledge of prepaid land use rights	28,600
Agriculture Bank of China | Long-term loan
Debt Instrument [Line Items]
Net book value of prepaid land use rights pledged as collateral	74,211
Bank loan secured by pledge of prepaid land use rights	28,600
Hefei High-Tech Industrial Development Zone Management Co., Ltd | Long-term loan
Debt Instrument [Line Items]
Net book value of prepaid land use rights pledged as collateral	213,840
Bank loan secured by pledge of prepaid land use rights	1,440,000
Shanghai Pudong Development Bank | Long-term loan
Debt Instrument [Line Items]
Net book value of prepaid land use rights pledged as collateral	26,086
Bank loan secured by pledge of prepaid land use rights	39,980

Borrowings_Details

Borrowings (Details) (CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Short-term loan:
Short-term loan	2,275,533	1,122,352
Long-term loan due in one year:
Long-term loan due in one year	22,000	936,163
Short-term borrowings and current portion of long term borrowings	2,297,533	2,058,515
Long-term loan
Long-term loan	1,902,400	1,554,000
Long-term loan	1,902,400	1,554,000
Total borrowings	4,199,933	3,612,515
Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	140,000
Bank of China | Bank Borrowings one due September 2014
Short-term loan:
Short-term loan		200,000
Bank of China | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	34,849
Bank of China | Bank Borrowings one due June 2015
Short-term loan:
Short-term loan	200,000
Bank of China | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	35,490
Agriculture Bank of China | Bank Borrowings one due September 2014
Short-term loan:
Short-term loan		80,000
Agriculture Bank of China | Bank Borrowings one due January 2014
Short-term loan:
Short-term loan		34,379
Agriculture Bank of China | Bank Borrowings one due February 2014
Short-term loan:
Short-term loan		79,248
Long-term loan due in one year:
Long-term loan due in one year		2,850
Agriculture Bank of China | Bank Borrowings one due April 2014
Short-term loan:
Short-term loan		539
Agriculture Bank of China | Bank Borrowings one due May 2014
Short-term loan:
Short-term loan		3,073
Agriculture Bank of China | Bank Borrowings two due April 2014
Short-term loan:
Short-term loan		95,721
Agriculture Bank of China | Bank Borrowings two due May 2014
Short-term loan:
Short-term loan		2,038
Agriculture Bank of China | Bank Borrowings three due May 2014
Short-term loan:
Short-term loan		1,996
Agriculture Bank of China | Bank Borrowings two due February 2014
Long-term loan due in one year:
Long-term loan due in one year		8,150
Agriculture Bank of China | Bank Borrowings one due August 2014
Long-term loan due in one year:
Long-term loan due in one year		2,850
Agriculture Bank of China | Bank Borrowings two due August 2014
Long-term loan due in one year:
Long-term loan due in one year		8,150
Agriculture Bank of China | Bank Borrowings one due August 2015
Long-term loan due in one year:
Long-term loan due in one year	2,850
Long-term loan
Long-term loan		2,850
Agriculture Bank of China | Bank Borrowings two due August 2015
Long-term loan due in one year:
Long-term loan due in one year	8,150
Long-term loan
Long-term loan		8,150
Agriculture Bank of China | Bank Borrowings one due February 2016
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due February 2016
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due August 2016
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due August 2016
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due February 2015
Short-term loan:
Short-term loan	30,000
Long-term loan due in one year:
Long-term loan due in one year	2,850
Long-term loan
Long-term loan		8,150
Agriculture Bank of China | Bank Borrowings one due February 2017
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due February 2017
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due August 2017
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due August 2017
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due February 2018
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due February 2018
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due August 2018
Long-term loan
Long-term loan	2,850	2,850
Agriculture Bank of China | Bank Borrowings two due August 2018
Long-term loan
Long-term loan	8,150	8,150
Agriculture Bank of China | Bank Borrowings one due February 2019
Long-term loan
Long-term loan	2,900	10,100
Agriculture Bank of China | Bank Borrowings two due February 2019
Long-term loan
Long-term loan	10,100	2,900
Agriculture Bank of China | Bank Borrowings one due August 2019
Long-term loan
Long-term loan	2,900	2,900
Agriculture Bank of China | Bank Borrowings two due August 2019
Long-term loan
Long-term loan	10,100	10,100
Agriculture Bank of China | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	76,363
Agriculture Bank of China | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	1,966
Agriculture Bank of China | Bank Borrowings one due January 2015
Short-term loan:
Short-term loan	50,000
Agriculture Bank of China | Bank Borrowings two due March 2015
Short-term loan:
Short-term loan	12,116
Agriculture Bank of China | Bank Borrowings one due May 2015
Short-term loan:
Short-term loan	20,000
Agriculture Bank of China | Bank Borrowings two due April 2015
Short-term loan:
Short-term loan	1,439
Agriculture Bank of China | Bank Borrowings three due April 2015
Short-term loan:
Short-term loan	1,955
Agriculture Bank of China | Bank Borrowings two due May 2015
Short-term loan:
Short-term loan	1,457
Agriculture Bank of China | Bank Borrowings three due May 2015
Short-term loan:
Short-term loan	2,988
Agriculture Bank of China | Bank Borrowings two due January 2015
Short-term loan:
Short-term loan	3,139
Agriculture Bank of China | Bank Borrowings two due February 2015
Short-term loan:
Short-term loan	66,746
Long-term loan due in one year:
Long-term loan due in one year	8,150
Long-term loan
Long-term loan		2,850
Agriculture Bank of China | Bank Borrowings three due January 2015
Short-term loan:
Short-term loan	3,625
Agriculture Bank of China | Bank Borrowings five due January 2015
Short-term loan:
Short-term loan	3,429
Agriculture Bank of China | Bank Borrowings three due February 2015
Short-term loan:
Short-term loan	38,418
Agriculture Bank of China | Bank Borrowings four due January 2015
Short-term loan:
Short-term loan	2,889
Agriculture Bank of China | Bank Borrowings four due February 2015
Short-term loan:
Short-term loan	3,483
Agriculture Bank of China | Bank Borrowings three due March 2015
Short-term loan:
Short-term loan	14,935
Agriculture Bank of China | Bank Borrowings Five Due February 2015
Short-term loan:
Short-term loan	74,040
Agriculture Bank of China | Bank Borrowings six due February 2015
Short-term loan:
Short-term loan	3,299
Agriculture Bank of China | Bank Borrowings four due March 2015
Short-term loan:
Short-term loan	2,288
Agriculture Bank of China | Bank Borrowings five due March 2015
Short-term loan:
Short-term loan	1,212
Agriculture Bank of China | Bank Borrowings six due March 2015
Short-term loan:
Short-term loan	2,472
Agriculture Bank of China | Bank Borrowings seven due March 2015
Short-term loan:
Short-term loan	3,209
Agriculture Bank of China | Bank Borrowings four due April 2015
Short-term loan:
Short-term loan	2,956
Agriculture Bank of China | Bank Borrowings four due May 2015
Short-term loan:
Short-term loan	2,084
Agriculture Bank of China | Bank Borrowings one due June 2016
Long-term loan
Long-term loan	80,000
China Merchants Bank | Bank Borrowings one due March 2014
Short-term loan:
Short-term loan		10,000
China Merchants Bank | Bank Borrowings two due March 2014
Short-term loan:
Short-term loan		10,000
China Merchants Bank | Bank Borrowings three due March 2014
Short-term loan:
Short-term loan		10,000
China Merchants Bank | Bank Borrowings four due March 2014
Short-term loan:
Short-term loan		10,000
China Merchants Bank | Bank Borrowings five due March 2014
Short-term loan:
Short-term loan		10,000
China Merchants Bank | Bank Borrowings one due June 2014
Short-term loan:
Short-term loan		30,000
China Merchants Bank | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	48,952
China Merchants Bank | Bank Borrowings one due June 2015
Short-term loan:
Short-term loan	30,000
China Merchants Bank | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	62,000
China Merchants Bank | Bank Borrowings one due May 2015
Short-term loan:
Short-term loan	28,759
China Merchants Bank | Bank Borrowings two due June 2015
Short-term loan:
Short-term loan	32,400
Huaxia Bank | Bank Borrowings two due February 2014
Short-term loan:
Short-term loan		40,000
Huaxia Bank | Bank Borrowings three due February 2014
Short-term loan:
Short-term loan		10,000
Huaxia Bank | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	30,000
Huaxia Bank | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	20,000
Bank of Communications | Bank Borrowings one due February 2014
Short-term loan:
Short-term loan		42,000
Bank of Communications | Bank Borrowings one due February 2015
Short-term loan:
Short-term loan	97,904
Bank of Communications | Bank Borrowings one due January 2015
Short-term loan:
Short-term loan	50,000
Hefei S & T Rural Commercial Bank | Bank Borrowings one due March 2014
Short-term loan:
Short-term loan		150,000
Hefei S & T Rural Commercial Bank | Bank Borrowings two due March 2014
Short-term loan:
Short-term loan		50,000
Hefei S & T Rural Commercial Bank | Bank Borrowings one due May 2015
Short-term loan:
Short-term loan	100,000
Hefei S & T Rural Commercial Bank | Bank Borrowings two due May 2015
Short-term loan:
Short-term loan	100,000
Rural Credit Cooperative of Hebei | Bank Borrowings one due March 2014
Short-term loan:
Short-term loan		28,000
Rural Credit Cooperative of Hebei | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	28,000
Bank of Xingtai | Bank Borrowings one due September 2014
Long-term loan due in one year:
Long-term loan due in one year		100,000
Bank of Xingtai | Bank Borrowings one due June 2014
Short-term loan:
Short-term loan		20,000
Bank of Xingtai | Bank Borrowings two due June 2014
Short-term loan:
Short-term loan		40,000
Bank of Xingtai | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	1,000
Bank of Xingtai | Bank Borrowings one due June 2015
Short-term loan:
Short-term loan	60,000
Bank of Xingtai | Bank Borrowings two due March 2015
Short-term loan:
Short-term loan	100
Bank of Xingtai | Bank Borrowings three due March 2015
Short-term loan:
Short-term loan	100
Bank of Xingtai | Bank Borrowings one due September 2015
Short-term loan:
Short-term loan	2,000
Bank of Xingtai | Bank Borrowings two due September 2015
Short-term loan:
Short-term loan	200
Bank of Xingtai | Bank Borrowings three due September 2015
Short-term loan:
Short-term loan	200
Bank of Xingtai | Bank Borrowings one due September 2016
Long-term loan
Long-term loan	74,000
Bank of Xingtai | Bank Borrowings one due March 2016
Long-term loan
Long-term loan	3,000
Bank of Xingtai | Bank Borrowings two due March 2016
Long-term loan
Long-term loan	300
Bank of Xingtai | Bank Borrowings two due September 2016
Long-term loan
Long-term loan	8,400
Bank of Xingtai | Bank Borrowings three due March 2016
Long-term loan
Long-term loan	300
Bank of Xingtai | Bank Borrowings three due September 2016
Long-term loan
Long-term loan	8,400
OCBC Bank | Bank Borrowings one due April 2014
Short-term loan:
Short-term loan		30,485
OCBC Bank | Bank Borrowings one due May 2014
Short-term loan:
Short-term loan		54,873
Other loan | Bank Borrowings one due March 2014
Short-term loan:
Short-term loan		30,000
Other loan | Bank Borrowings one due November 2014
Short-term loan:
Short-term loan		50,000
China Construction Bank | Bank Borrowings one due April 2014
Long-term loan due in one year:
Long-term loan due in one year		157,000
China Construction Bank | Bank Borrowings one due May 2014
Long-term loan due in one year:
Long-term loan due in one year		34,000
China Construction Bank | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	48,500
China Construction Bank | Bank Borrowings one due May 2015
Short-term loan:
Short-term loan	34,000
China Construction Bank | Bank Borrowings two due April 2015
Short-term loan:
Short-term loan	100,000
China Construction Bank | Bank Borrowings three due April 2015
Short-term loan:
Short-term loan	11,500
China Construction Bank | Bank Borrowings two due May 2015
Short-term loan:
Short-term loan	48,789
China Construction Bank | Bank Borrowings three due May 2015
Short-term loan:
Short-term loan	22,171
Industrial and Commercial Bank of China | Bank Borrowings one due March 2014
Long-term loan due in one year:
Long-term loan due in one year		140,000
Industrial and Commercial Bank of China | Bank Borrowings two due March 2014
Long-term loan due in one year:
Long-term loan due in one year		40,000
Industrial and Commercial Bank of China | Bank Borrowings three due March 2014
Long-term loan due in one year:
Long-term loan due in one year		20,000
Industrial and Commercial Bank of China | Bank Borrowings one due June 2014
Long-term loan due in one year:
Long-term loan due in one year		15,917
Industrial and Commercial Bank of China | Bank Borrowings two due June 2014
Long-term loan due in one year:
Long-term loan due in one year		57,246
Industrial and Commercial Bank of China | Bank Borrowings one due November 2014
Long-term loan due in one year:
Long-term loan due in one year		150,000
Industrial and Commercial Bank of China | Bank Borrowings one due January 2019
Long-term loan
Long-term loan	168,000	720,000
Industrial and Commercial Bank of China | Bank Borrowings one due January 2018
Long-term loan
Long-term loan	300,000	432,000
Industrial and Commercial Bank of China | Bank Borrowings one due January 2017
Long-term loan
Long-term loan	288,000	288,000
Industrial and Commercial Bank of China | Bank Borrowings one due March 2015
Short-term loan:
Short-term loan	50,000
Industrial and Commercial Bank of China | Bank Borrowings one due October 2015
Short-term loan:
Short-term loan	50,000
Industrial and Commercial Bank of China | Bank Borrowings one due June 2015
Short-term loan:
Short-term loan	50,000
Industrial and Commercial Bank of China | Bank Borrowings one due April 2015
Short-term loan:
Short-term loan	50,000
Industrial and Commercial Bank of China | Bank Borrowings one due January 2015
Short-term loan:
Short-term loan	58,131
Industrial and Commercial Bank of China | Bank Borrowings one due May 2015
Short-term loan:
Short-term loan	2,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2015
Short-term loan:
Short-term loan	150,000
Industrial and Commercial Bank of China | Bank Borrowings two due November 2015
Short-term loan:
Short-term loan	2,000
Industrial and Commercial Bank of China | Bank Borrowings two due January 2019
Long-term loan
Long-term loan	300,000
Industrial and Commercial Bank of China | Bank Borrowings three due January 2019
Long-term loan
Long-term loan	252,000
Industrial and Commercial Bank of China | Bank Borrowings two due January 2018
Long-term loan
Long-term loan	132,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2016
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2016
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2017
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2017
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2018
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2018
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2019
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2019
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2020
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2020
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2021
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2021
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2022
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2022
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2023
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2023
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2024
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2024
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2025
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2025
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2026
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2026
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2027
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due Novemebr 2027
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2028
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due November 2028
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due May 2029
Long-term loan
Long-term loan	7,000
Industrial and Commercial Bank of China | Bank Borrowings one due December 2029
Long-term loan
Long-term loan	7,000
China Everbright Bank | Bank Borrowings one due June 2014
Long-term loan due in one year:
Long-term loan due in one year		200,000
Shanghai Pudong Development Bank | Bank Borrowings one due August 2015
Short-term loan:
Short-term loan	39,980

Borrowings_Details_2

Borrowings (Details 2) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Borrowings
Short-term	2,275,533	1,122,352
Long-term, current portion	22,000	936,163
Subtotal	2,297,533	2,058,515
Long-term	1,902,400	1,554,000
Total borrowings	4,199,933	3,612,515
Borrowings
Weighted average interest rate (as a percent)	6.07%	6.42%
Interest rate (as a percent)	9.00%
Principal amount of short-term borrowings	2,275,533	1,122,352
Short-term	2,275,533	1,122,352
Principal amount of long-term borrowings	1,902,400	1,554,000
Unused lines of credit	690,710
Unused line of credit secured by project assets	100,000
Interest incurred	267,718	278,190	348,510
Interest capitalized in the cost of property, plant and equipment and project assets	38,053	37,495	45,059
Maximum gearing ratio	55.00%
Future principal repayments on the long-term borrowings
2015	22,000
2016	210,400
2017	324,000
2018	468,000
Thereafter	900,000
Total	1,924,400
Bank of Xingtai
Borrowings
Restricted cash collateral amount	20,000
Agriculture Bank of China
Borrowings
Long-term bank loan secured by pledge of buildings	85,400
Bank loan secured by pledge of prepaid land use rights	28,600
Net book value of buildings pledged as collateral	218,603
Donghai Jingtian Construction Corp
Borrowings
Bank loan secured by pledge of prepaid land use rights	39,980
Industrial and Commercial Bank of China
Borrowings
Short-term bank loans secured by pledge of project assets	4,000
Long-term bank loans secured by pledge of project assets	196,000
Net book value of project assets pledged as collateral	310,029
Hefei High-Tech Industrial Development Zone Management Co., Ltd
Borrowings
Long-term entrustment loan secured by pledge of property, plant and equipment and land use rights	1,440,000
Net book value of buildings, machineries and equipment and construction in progress pledged as collateral	834,341
China Construction Bank | JA Hebei
Borrowings
Maximum borrowing capacity	194,000
Minimum current ratio	1.6
Minimum quick ratio	1.5
Maximum ratio of long-term investment to net asset	30.00%
Maximum ratio of external quarantee to net asset	55
Huaxia Bank | JA Yangzhou
Borrowings
Maximum borrowing capacity	80,000
Maximum gearing ratio	70.00%
Lines of credit | China Development Bank Shanghai Branch
Borrowings
Maximum borrowing capacity	30,000,000
Short-term loans | Bank of Xingtai
Borrowings
Loan secured by restricted cash balance	600
Short-term loans | Donghai Jingtian Construction Corp
Borrowings
Net book value of prepaid land use rights pledged as collateral	26,086
Unsecured short-term bank borrowings
Borrowings
Short-term	2,090,953	956,994
Borrowings
Weighted average interest rate (as a percent)	5.66%	6.04%
Interest rate, minimum (as a percent)	1.35%	2.67%
Interest rate, maximum (as a percent)	7.82%	7.80%
Principal amount of short-term borrowings	2,090,953	956,994
Short-term	2,090,953	956,994
Short-term borrowings secured by restricted cash
Borrowings
Short-term	600	85,358
Borrowings
Weighted average interest rate (as a percent)	6.53%	1.67%
Interest rate (as a percent)	6.15%
Interest rate, minimum (as a percent)	6.15%	1.66%
Interest rate, maximum (as a percent)	6.90%	1.67%
Principal amount of short-term borrowings	600	85,358
Short-term	600	85,358
Short term bank borrowings secured by assets
Borrowings
Short-term	183,980
Borrowings
Principal amount of short-term borrowings	183,980
Short-term	183,980
Short-term bank borrowings from non-financial institution
Borrowings
Short-term		80,000
Borrowings
Interest rate (as a percent)		9.00%
Principal amount of short-term borrowings		80,000
Short-term		80,000
Number of non-financial institutions		1
Long-term loan | Bank of Xingtai
Borrowings
Loan secured by restricted cash balance	17,400
Long-term loan | Agriculture Bank of China
Borrowings
Bank loan secured by pledge of prepaid land use rights	28,600
Net book value of prepaid land use rights pledged as collateral	74,211
Long-term loan | Hefei High-Tech Industrial Development Zone Management Co., Ltd
Borrowings
Bank loan secured by pledge of prepaid land use rights	1,440,000
Net book value of prepaid land use rights pledged as collateral	213,840
Unsecured long-term bank borrowings
Borrowings
Long-term	157,000	914,163
Borrowings
Weighted average interest rate (as a percent)	6.64%	6.48%
Interest rate, minimum (as a percent)	6.52%	6.15%
Interest rate, maximum (as a percent)	6.77%	7.07%
Principal amount of long-term borrowings	157,000	914,163
Long-term bank borrowings secured by buildings, machineries and equipment and construction in progress
Borrowings
Long-term	1,767,400	1,576,000
Borrowings
Weighted average interest rate (as a percent)	6.46%	6.74%
Interest rate, minimum (as a percent)	6.15%	6.72%
Interest rate, maximum (as a percent)	7.01%	7.01%
Principal amount of long-term borrowings	1,767,400	1,576,000
Minimum
Borrowings
Maturity period	5 months
Maximum
Borrowings
Maturity period	179 months

Senior_Convertible_Notes_Detai

Senior Convertible Notes (Details)

1 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

31-May-13

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

13-May-08

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

19-May-08

13-May-08

Dec. 31, 2012

Dec. 31, 2012

13-May-08

CNY

CNY

CNY

CNY

Warrant derivatives

Warrant derivatives

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

4.5% Senior Convertible Notes due 2013

CNY

CNY

CNY

USD ($)

USD ($)

CNY

USD ($)

CNY

USD ($)

USD ($)

Minimum

Maximum

Maximum

USD ($)

Senior Convertible Notes

Aggregate principal amount

$350,000,000

Interest rate (as a percent)

9.00%

4.50%

Number of days granted to underwriters for the option to purchase additional Senior Notes

30 days

Option granted to underwriters to purchase additional aggregate principal amount of Senior Notes

50,000,000

Completed public offering including underwriter's option to purchase additional Senior Notes

400,000,000

Net proceeds from the offering

2,709,538,000

Amount of unamortized financing costs

80,010,000

Amount of financing costs amortized through interest expense

2,606,000

9,656,000

Percentage of the effective conversion price as a condition for conversion or redemption of Senior Notes

130.00%

Minimum number of trading days triggering conversion or redemption feature

20 days

The maximum period of consecutive trading days that the closing price of the Company's ADS exceeds a specified percentage of the conversion price to trigger conversion or redemption feature of notes

30 days

Redemption price as percentage of principal amount of notes plus accrued and unpaid interest

100.00%

Interest expenses recognized

12,300,000

56,893,000

Principal amount used for debt instrument conversion ratio

1,000

Conversion rate per $1000 principal amount of the Senior Notes (in ADS)

6.5628

Par value per share (in dollars per share)

$0.00

Conversion price (in dollars per ADS)

$152.38

Change in fair value of the Embedded Derivatives

84,484,000

-51,867,000

9,334,000

0

32,000

Interest expense recognized for accretion to the redemption value

24,216,000

96,532,000

Principal amount of debt bought back

0

105,427,000

Buyback price as a percentage of principal amounts

72.48%

95.35%

Gain/(loss) from convertible notes buyback

-8,466,000

0

-8,466,000

Repayment of remaining principal amount

723,742,000

740,027,000

Senior_Convertible_Notes_Detai1

Senior Convertible Notes (Details 2) (4.5% Senior Convertible Notes due 2013)	1 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2008	Sep. 15, 2008	12-May-08
	CNY	GBP (£)	CNY	CNY	USD ($)	CNY	CNY		CNY
ADS Lending Agreement
Shares loaned to the ADS Borrowers									2,625,104
Nominal lending fees to be received from the ADS Borrowers (in dollars per ADS)					$0.00
Number of shares loaned to ADS borrower that filed for bankruptcy								1,312,552
Fair value of the outstanding loaned shares					$5,605	35,230			230,729
Interest cost recognized relating to the amortization of the issuance cost				8,208		29,537
Expense recognized due to bankruptcy of one of the ADS borrowers							469,042
Unamortized amount of issuance costs						8,253
Amount of unsecured claim admitted under Claims Determination Deed	380,075	38,200
Cash consideration for sale of certain rights pertaining to the claim and all rights to receive distribution payments	369,153	37,100
Gain recorded on settlement of claim			369,153

Other_payables_to_third_partie2

Other payables to third parties (Details) (CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other payables to third parties
Purchases of property, plant and equipment	195,069	221,232
Payables for project assets	134,667
Payable for land use rights	33,000	35,000
Miscellaneous tax payables	34,033	18,253
Deposits	21,679	5,433
Labor services payables	8,634	11,959
Logistic charges	48,132	28,422
Payable to staff		52,732
Interest	181,857	88,060
Others	36,300	21,179
Total other payables	693,371	482,270
Weighted average interest rate at which short term borrowings are borrowed from employees (as a percent)	9.00%

Accrued_expenses_Details

Accrued expenses (Details) (CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accrued expenses
Professional service fees	19,885	10,659
Interest	47,250	107,611
Utilities	2,109	2,685
Logistic charges	23,738	11,153
Tax	16,159	12,740
Others	38,153	21,206
Total accrued expenses	147,294	166,054

Accrued_warranty_cost_Details

Accrued warranty cost (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accrued warranty cost
Beginning balance	158,897	114,226	78,751
Warranty provision	92,843	44,671	42,167
Warranty utilization			-6,692
Ending balance	251,740	158,897	114,226

Sharebased_compensation_Detail

Share-based compensation (Details)	12 Months Ended			0 Months Ended		12 Months Ended											1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 18, 2006	Aug. 18, 2006	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2012	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
	USD ($)	USD ($)	USD ($)	2006 Stock Incentive Plan (the "Plan")	2006 Stock Incentive Plan (the "Plan")	Options	Options	Options	Options	Options	Options	Options	Options	Options	Options	Options	Options	Restricted share units ("RSU")	Restricted share units ("RSU")	Restricted share units ("RSU")	Restricted share units ("RSU")	Restricted share units ("RSU")	Restricted share units ("RSU")
	plan					USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	USD ($)	Minimum	Minimum	Maximum	Maximum	2014 Plan	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY
Share-based compensation
Number of share-based compensation plans	2
Shares approved for issuance					8,656,000
Lower range limit of the exercise price of the options	$1.76
Upper range limit of the exercise price of the options	$1.89
Share-based compensation, authorized percentage of additional share capital issued following effective date of plan				10.00%
Share-based compensation, authorized percentage of share capital issued and outstanding following effective date of plan																	10.00%
Award pool as maximum percentage of issued and outstanding shares requiring automatic increase to award pool																	1.00%
Award pool as percentage of issued and outstanding shares after required automatic increase to award pool																	10.00%
Recognized pre-tax charge included in selling, general, and administrative expenses and manufacturing overhead							14,544,000		3,558,000		12,980,000								1,737,000		5,843,000		20,249,000
Recognized pre-tax charge capitalized in cost of inventory							3,000		372,000		1,256,000
Weighted-average grant-date fair value of options granted (in dollars per share)						$1.88		$0		$1.40
Compensation measured at grant date, net of forfeitures							14,541,000		3,186,000		11,724,000
Forfeitures, measured at grant date fair value							774,000		577,000		1,616,000
Forfeiture rate (as a percent)						10.05%	10.05%	10.92%	10.92%	9.82%	9.82%
Total unrecognized compensation cost							13,781,000		92,000		3,788,000								536,000		2,437,000
Weighted-average period for recognition of unrecognized compensation cost						25 months	25 months											5 months	5 months
Fair value assumptions for options granted to employees
Average risk-free rate (as a percent)													1.80%	1.09%	2.01%	1.27%
Weighted average expected option life						6 years	6 years			5 years 9 months	5 years 9 months
Volatility rate (as a percent)										80.50%	80.50%		56.22%		100.06%
Shares
Outstanding at the beginning of the period (in shares)						2,581,550	2,581,550	4,357,050	4,357,050	2,690,650	2,690,650
Granted (in shares)						3,660,000	3,660,000			2,207,000	2,207,000
Forfeited (in shares)						-296,500	-296,500	-1,373,750	-1,373,750	-540,600	-540,600
Exercised (in shares)						-268,750	-268,750	-401,750	-401,750
Outstanding at the end of the period (in shares)						5,676,300	5,676,300	2,581,550	2,581,550	4,357,050	4,357,050	2,690,650
Exercisable at the end of the period (in shares)						2,261,300	2,261,300
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)						$4.79		$4.28		$6.71
Granted (in dollars per share)						$1.88				$1.40
Forfeited (in dollars per share)						$2.21		$1.37		$4.60
Exercised (in dollars per share)						$1.37		$1.37
Outstanding at the end of the period (in dollars per share)						$3.21		$4.79		$4.28		$6.71
Exercisable at end of the period (in dollars per share)						$5.23
Weighted Average Remaining Contractual Life (Year)
Outstanding at the beginning of the period						7 years 7 months 2 days	7 years 7 months 2 days	6 years 4 months 24 days	6 years 4 months 24 days	7 years 7 months 13 days	7 years 7 months 13 days	7 years 2 months 1 day
Outstanding at the end of the period						7 years 7 months 2 days	7 years 7 months 2 days	6 years 4 months 24 days	6 years 4 months 24 days	7 years 7 months 13 days	7 years 7 months 13 days	7 years 2 months 1 day
Exercisable at the end of the period						5 years 2 months 9 days	5 years 2 months 9 days
Intrinsic Value
Outstanding at the beginning of the period						612,000
Outstanding at the end of the period						279,000		612,000
Exercisable at the end of the period						273,000
Total intrinsic value of options exercised						186,000		134,000		0
Shares
Nonvested at the beginning of the period (in shares)																		1,016,110	1,016,110	2,438,000	2,438,000	2,493,000	2,493,000
Granted (in shares)																		90,000	90,000			90,000	90,000
Vested (in shares)																		-85,000	-85,000	-1,281,890	-1,281,890	-95,000	-95,000
Forfeited (in shares)																		-62,500	-62,500	-140,000	-140,000	-50,000	-50,000
Nonvested at the end of the period (in shares)																		958,610	958,610	1,016,110	1,016,110	2,438,000	2,438,000
Weighted Average Fair Value
Nonvested at the beginning of the period (in dollars per share)																		$4.95		$4.97		$5.17
Granted (in dollars per share)																		$1.99				$0.79
Vested (in dollars per share)																		$5.11		$5.04		$5.92
Forfeited (in dollars per share)																		$5.52		$4.28		$5.85
Nonvested at the end of the period (in dollars per share)																		$4.62		$4.95		$4.97
Fair value of shares vested																			1,000,000		2,182,000		997,000
Share-based compensation, income tax benefit	$0	$0	$0

Foreign_currency_forward_contr2

Foreign currency forward contracts (Details)

12 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

CNY

CNY

CNY

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

Foreign exchange forward contracts

USD ($)

CNY

EUR (€)

GBP (£)

JPY (¥)

USD ($)

CNY

EUR (€)

GBP (£)

JPY (¥)

USD ($)

CNY

EUR (€)

GBP (£)

Not designated as hedging instruments

Not designated as hedging instruments

Cash Flow Hedge

CNY

CNY

Foreign currency forward contracts

Hedging period, cash flows associated with third-party sales

12 months

Notional amount of derivative contracts entered

$25,917

€ 75,164

£ 171

¥ 922,031

$20,683

€ 64,254

£ 11,453

¥ 94,500

$87,119

€ 158,463

£ 4,153

Gain /(loss) from the change in the fair value on the effective portion of derivative contract

0

0

-11,755

Gain/(loss) from the change in the fair value on the ineffective portion of derivative contract

10,470

-793

9,303

Outstanding notional balances and the estimated fair value of derivative contracts

Notional amount

22,284

384,584

11,082

192,201

93,295

Estimate fair value

5,541

237

Issuance_of_ordinary_shares_an1

Issuance of ordinary shares and warrants (Details)

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Aug. 14, 2013

Aug. 14, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Nov. 30, 2013

Dec. 31, 2014

Feb. 28, 2014

Dec. 31, 2014

31-May-14

Dec. 31, 2014

Aug. 14, 2013

Aug. 14, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Aug. 14, 2013

Aug. 13, 2013

Aug. 14, 2013

Aug. 13, 2013

Dec. 31, 2014

Nov. 30, 2013

Dec. 31, 2014

Feb. 28, 2014

Dec. 31, 2014

31-May-14

Dec. 31, 2014

USD ($)

CNY

CNY

CNY

USD ($)

USD ($)

Series A-1 Warrant

Series A-1 Warrant

Series A-2 Warrant

Series A-2 Warrant

Series A-3 Warrant

Series A-3 Warrant

Series B Warrant

Ordinary shares.

Ordinary shares.

Ordinary shares.

Ordinary shares.

Ordinary shares.

Ordinary shares.

ADS

ADS

ADS

ADS

ADS

ADS

ADS

ADS

ADS

ADS

ADS

CNY

CNY

CNY

USD ($)

Series A-1 Warrant

Series A-2 Warrant

Series A-3 Warrant

Series B Warrant

USD ($)

USD ($)

Series A-1 Warrant

Series A-1 Warrant

Series A-2 Warrant

Series A-2 Warrant

Series A-3 Warrant

Series A-3 Warrant

Series B Warrant

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Issuance of ordinary shares and warrants

Value of shares issued

$24,000

147,998

9

Number of shares issued

15,228,425

15,228,425

3,045,685

3,045,685

Par value (in dollars per share)

$0.00

$0.00

$0.00

Issue price (in dollars per share)

$7.88

Offering price as a percentage of volume-weighted average price of ADSs

94.00%

Share price (in dollars per share)

$8.38

Proceeds from issuance of offering

128,529

128,529

Warrants issued (in shares)

12,724,164

12,724,164

12,724,164

50,896,656

2,544,833

2,544,833

2,544,833

10,179,332

Exercisable period

3 months

6 months

9 months

Initial exercise price (in dollars per share)

$1.89

$1.89

$1.89

$2.18

$9.43

$9.43

$9.43

$10.90

Exercisable period after the one-year anniversary

1 day

Expiration period

2 years

Fair value of warrants

172,916

35,693

2,797

3,530

Fair value of warrants in excess of net proceeds of equity offering

44,396

44,396

Loss recognized based on a subsequent change in fair value of the warrants

74,014

51,074

Exercise price (in dollars per share)

$9.43

$9.43

$9.43

Mainland_China_contribution_pl2

Mainland China contribution plan and profit appropriation (Details)

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

CNY

CNY

CNY

PRC subsidiaries

PRC subsidiaries

PRC subsidiaries

JA Hebei

Shanghai JA Solar Technology Co., Ltd. ("JA Fengxian")

Shanghai JA Solar PV Technology Co., Ltd. ("JA Zhabei")

JA Yangzhou

Jing Hai Yang Semiconductor Materials (Donghai) Co., Ltd. ("JA Lianyungang")

JA Yangzhou PV Technology Co., Ltd. ("JA Yangzhou PV")

Shanghai Jinglong Solar Technology Co., Ltd. ("JA Jinglong")

Donghai JA Solar Technology Co., Ltd. ("JA Wafer R&D")

JA (Hefei) Renewable Energy Co., Ltd. ("JA Hefei Renewable Energy")

JA Hebei

Solar Silicon Valley Electronic Science and Technology Co., Ltd. ("Solar Silicon Valley")

JA Solar Investment China Co., Ltd ("JA Investment")

Dunhuang JA Solar Power Development Co., Ltd ("JA Dunhuang")

Hebei Ningjin Songgong Semiconductor Co., Ltd.

JA Solar PV Technology Co., LTD

JA Solar PV Electric (Shexian) Co,. Ltd

Aiyouen Power Electric (Yinchuan) Company Limited

JA Solar PV Electric (Baotou) Company Limited

Beijing JA Solar PV Technology Co., Ltd

JA Solar PV Electric (Huanghua) Co,. Ltd

JA Solar PV Electric (Yanchi) Co,. Ltd

JA New Energy Development (Hebei) Co., Ltd

CNY

CNY

CNY

CNY

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

CNY

CNY

USD ($)

CNY

USD ($)

USD ($)

CNY

CNY

USD ($)

CNY

CNY

CNY

CNY

CNY

CNY

CNY

China Contribution Plan

Total contribution for employee benefit plan under China contribution plan

104,719

96,062

95,929

Statutory Reserves

Percentage appropriation to general reserve fund required

10.00%

Reserve level threshold for mandatory transfer requirement (as a percent)

50.00%

Mainland China contribution plan and profit appropriation

Restricted net assets

7,174,059

26,657

1,760

0

Reversal of common statutory reserve fund due to an adjustment related to income tax filing difference

8,257

Paid-in-capital amounts unavailable for distribution as nominal dividend

1,000,000

$80,000

$20,000

$260,000

$98,000

$10,000

180,000

50,000

$15,000

1,440,000

$36,986

$40,000

254,000

275,000

$10,000

3,000

26,000

2,000

20,000

1,000

4,000

1,000

Earnings_loss_per_share_Detail

Earnings (loss) per share (Details)	12 Months Ended										12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	CNY	CNY	CNY	Options, RSUs, and Convertible Notes	Options and RSUs	Options and RSUs	Warrants	Series B warrant	ADS	ADS	JA Solar Holdings Co., Ltd.	JA Solar Holdings Co., Ltd.	JA Solar Holdings Co., Ltd.
									Series B warrant	Series A-3 Warrant	CNY	CNY	CNY
									USD ($)	USD ($)
Numerator :
Net (loss)/income	446,650	-426,492	-1,662,257								423,771	-429,280	-1,662,257
Less: fair value of warrants in excess of net proceeds of equity offering		-44,396
Less: allocation of net income to participating warrant holder.	-77,174
Income (Loss) Attributable to Parent, Total	346,597	-473,676	-1,662,257
Dilutive effect of:
Add back allocation to participating warrant holder	4,336
Excluding fair value gain	-16,716
Numerator for diluted earnings per share	334,217	-473,676	-1,662,257
Denominator:
Denominator for basic loss per share - weighted average ordinary shares outstanding	242,192,859	201,317,884	194,788,429
Dilutive effect of share options and RSUs	363,633
Dilutive effect of convertible notes and warrants	306,592
Denominator for diluted loss per share (in shares)	242,863,084	201,317,884	194,788,429
Basic (loss)/ earnings per share	1.43	-2.35	-8.53
Diluted (loss)/ earnings per share	1.38	-2.35	-8.53
Initial exercise price (in dollars per share)									$10.90	$9.43
Options not included in calculation because of anti-dilutive effect				5,628,371	2,856,278	3,433,109	30,806,670	52,569,971

Related_party_transactions_Det

Related party transactions (Details) (CNY)	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2006	Dec. 31, 2010	Jun. 30, 2013
Related party transactions
Amounts due to related parties-short term	339,317	326,890
Amounts due from related parties-short term	47,890	43,436
Total amounts due from related parties	500,311	452,736
Outsourcing processing service provided	14,735	7,124	26,704
Rental expenses under operating lease agreements	61,950	53,422	23,357
Guarantees received by entity	752,047	278,000
Sales of products	188,597	396,505	243,220
Purchase of products	1,079,882	645,139	827,711
Purchase of equipment	79,941	1,967	2,481
Sales of equipment		5,000
Guarantees provided by entity	0	20,000
Entrustment loan provided	40,000	40,000
Hebei Jinglong
Related party transactions
Amounts due to related parties-short term	8,040	13,462
Amounts due from related parties-short term	60,000	113,000
Receivables from related parties-short term	106,194	65,567
Amounts due from related parties-long term	10,145	603
Initial term of long-term supply contract				4 years 6 months
Extended term of long-term supply contract					3 years
Purchase of silicon wafer supplies	0	205,047	191,339
Unused prepayment	70,145	113,603
Outsourcing processing service provided	320	1,024	17,899
Rental expenses under operating lease agreements	47,352	42,089	12,000
Guarantees received by entity	672,047	228,000
Jing Wei
Related party transactions
Amounts due to related parties-short term	84,020	97,648
Receivables from related parties-short term	28,194	72,510
Xingtai Jinglong
Related party transactions
Amounts due to related parties-short term	63,633	60,807
Receivables from related parties-short term	19,694	58,750
Songgong Electronics
Related party transactions
Amounts due to related parties-short term	17,302	37,456
Receivables from related parties-short term	67,243	38,598
Yangguang Guifeng
Related party transactions
Amounts due to related parties-short term	88,757	55,965
Receivables from related parties-short term	40,726	44,266
Saimei Ganglong
Related party transactions
Amounts due to related parties-short term	34,821
Fine Chemical
Related party transactions
Amounts due to related parties-short term	24,827
Other related parties
Related party transactions
Amounts due to related parties-short term	17,917	61,552
Amounts due from related parties-short term	7,890	3,436
Receivables from related parties-short term	10,818	16,006
Outsourcing processing service provided			7,618
Sales of products	115,382		3,204
Purchase of products			12,515
Hebei Ningjin Songgong Semiconductor Co., Ltd. ("Ningjin Songgong")
Related party transactions
Sales of products		1,531	67,393
Purchase of products		35,504	350,685
Lin Cheng
Related party transactions
Amounts due from related parties-short term	109,407
Yangzhou Property
Related party transactions
Amounts due from related parties-short term	40,000	40,000
Guarantees received by entity	80,000	50,000
Purchase of equipment	77,398
Guarantees provided by entity		20,000
Entrustment loan provided	40,000	40,000
Consideration for acquisition	77,398
Annual interest rate						6.60%
Repayment term (in years)						1 year
Subsidiaries of Hebei Jinglong
Related party transactions
Outsourcing processing service provided	14,735	7,124	19,086
Sales of products	73,215	394,974	172,623
Purchase of products	1,079,882	609,635	464,511
Purchase of equipment	2,543	1,967	2,481
Sales of equipment		5,000
Mr. Baofang Jin | Hebei Jinglong
Related party transactions
Percentage of ownership interest held by related party				32.96%
Mr. Baofang Jin | Jinglong BVI
Related party transactions
Percentage of ownership interest held by related party				32.96%

Contingencies_and_Commitments_1

Contingencies and Commitments (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	CNY	CNY	Vendor D	Vendor D	"Take or pay" supply agreements	"Take or pay" supply agreements	"Take or pay" supply agreements	"Take or pay" supply agreements	"Take or pay" supply agreements	Other Multi-year supply agreements	Polysilicon	Silicon wafers
			Long-term supply contract	Long-term supply contract	CNY	CNY	CNY	Vendor D	Vendor D	CNY	item	item
			USD ($)	CNY				CNY	CNY
Supplier contract
Purchase obligations not performed								507,000,000	259,000,000
Purchases made under "take or pay" agreements					1,581,048,000	957,358,000	1,098,601,000
2015	2,974,443,000				2,674,655,000					299,788,000
2016	2,017,101,000				1,634,874,000					382,227,000
2017	1,598,344,000				1,598,344,000
2018	1,561,813,000				1,561,813,000
2019	1,525,283,000				1,525,283,000
Thereafter	761,816,000				761,816,000
Total	10,438,800,000				9,756,785,000					682,015,000
Other supply agreement with variable price provisions
Supply agreements with variable price provisions 2015-2017											0	720,000,000
Outstanding supplier advances	441,559,000	753,310,000			561,363,000	732,394,000
Damages sought by supplier			921,000,000
Provision for balance of advance payment made to supplier			$10,200,000	63,300,000

Contingencies_and_Commitments_2

Contingencies and Commitments (Details 2) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Future minimum obligations for operating leases
2015	65,387
2016	41,751
2017	1,790
Total	108,928
Rent expense	61,950	53,422	23,357
Capital expenditure
Amount contracted for capital expenditure on machinery and equipment	427,420

Fair_value_measurements_Detail

Fair value measurements (Details) (Fair value, measurements, recurring, CNY)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance at the end of the period | Foreign exchange forward contracts
Assets:
Derivative assets	5,541	237
Balance at the end of the period | Derivatives liabilities - warrants
Liabilities:
Derivatives liabilities - warrants	-105,785	-185,365
Significant Other Observable Inputs (Level 2) | Foreign exchange forward contracts
Assets:
Derivative assets	5,541	237
Significant Unobservable Inputs (Level 3) | Derivatives liabilities - warrants
Liabilities:
Derivatives liabilities - warrants	-105,785	-185,365

Fair_value_measurements_Detail1

Fair value measurements (Details 2) (Warrant derivatives, Significant Unobservable Inputs (Level 3), CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Warrant derivatives | Significant Unobservable Inputs (Level 3)
Changes in fair value of liabilities measured on recurring basis using unobservable input
Balance at the beginning of the period	-185,365
Fair value balance as of Aug. 13, 2013		-172,916
Unrealized gain included in change in fair value of warrant derivatives	74,014	-51,074
Exercise of warrants reclassified to additional paid-in capital	6,343	35,701
Exchange gain	-777	2,924
Balance at the end of the period	-105,785	-185,365

Fair_value_measurements_Detail2

Fair value measurements (Details 3) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Total (losses)			397,789
Change in fair value of derivatives	84,484	-51,867	9,334
Derivatives liabilities - warrants
Assets:
Change in fair value of derivatives	74,014	-51,074
Foreign exchange forward contracts | Not designated as hedging instruments
Assets:
Change in fair value of derivatives	10,470	-793	9,302
JA MEMC
Assets:
Other-than-temporary impairment charge	0	0	38,000
Carrying amount | JA MEMC
Assets:
Investment in a joint venture			50,910
Fair value, measurements, non-recurring
Assets:
Total (losses)			397,789
Other-than-temporary impairment charge			-38,000
Fair value, measurements, non-recurring | Balance at the end of the period
Assets:
Long-lived assets			515,854
Investment in a joint venture			50,910
Fair value, measurements, non-recurring | Significant Unobservable Inputs (Level 3)
Assets:
Long-lived assets			515,854
Investment in a joint venture			50,910
Fair value, measurements, non-recurring | Significant Unobservable Inputs (Level 3) | Carrying amount
Assets:
Long-lived assets			913,643

Segment_information_Details

Segment information (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment information
Total net revenue	11,295,523	7,182,789	6,719,065
China
Segment information
Total net revenue	3,741,732	3,001,498	3,086,589
Outside china:
Segment information
Total net revenue	7,553,791	4,181,291	3,632,476
Germany
Segment information
Total net revenue	202,315	660,589	1,265,827
Japan
Segment information
Total net revenue	3,852,572	1,596,703	436,443
Rest of the world
Segment information
Total net revenue	3,498,904	1,923,999	1,930,206

Certain_risks_and_uncertaintie1

Certain risks and uncertainties (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
			customer
Certain risks and uncertainties
Percentage required for qualifying as major customer			10.00%
Aggregate amount of cash and cash equivalents	2,155,009	2,119,740	3,031,462	3,889,092
Foreign currency risk | Denominated in RMB
Certain risks and uncertainties
Aggregate amount of cash and cash equivalents	1,121,695	1,180,356
Accounts receivable | Accounts receivable balances | 3 largest customers
Certain risks and uncertainties
Revenue and accounts receivable by major customer (as a percent)	17.00%	17.00%
Revenues | Customer concentration risk
Certain risks and uncertainties
Number of individual customers accounting for 10% or more of total revenues			0
Revenues | Geographic concentration risk | Japan
Certain risks and uncertainties
Number of individual customers accounting for 10% or more of total revenues	1	1
Revenue and accounts receivable by major customer (as a percent)	28.80%	18.60%

Ordinary_shares_Details

Ordinary shares (Details)	12 Months Ended
	Dec. 31, 2010
Ordinary shares
Number of votes per share	1

Restricted_net_assets_Details

Restricted net assets (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Restricted net assets
Annual appropriations as a percentage of net after-tax income to be set aside prior to payment of any dividends	10.00%
Restricted net assets	7,174,059
Restricted portion of net assets as a percentage of total consolidated net assets	133.80%

Additional_information_condens2

Additional information - condensed financial statements of the Company (Details) (CNY)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statement Of Operations
Total operating expenses	-1,093,990	-853,542	-1,385,863
(Loss)/Income from continuing operations	662,505	-91,253	-1,440,221
Interest expense	-229,665	-285,618	-489,346
Change in fair value of derivatives	84,484	-51,867	9,334
Share of loss/(income) from subsidiaries	-441	-2,108	-43,501
Convertible bond buyback loss			-8,466
Other income/(loss)	33,114	16,064	398,861
(Loss)/income before income taxes	520,040	-441,519	-1,561,632
Net (loss)/income	446,650	-426,492	-1,662,257
Net (loss)/income attributable to JA Solar's ordinary shareholders	346,597	-473,676	-1,662,257
JA Solar Holdings Co., Ltd.
Consolidated Statement Of Operations
Total operating expenses	-38,940	-24,368	-22,576
(Loss)/Income from continuing operations	-38,940	-24,368	-22,576
Interest expense		-47,330	-192,618
Change in fair value of derivatives	74,014	-51,074	32
Share of loss/(income) from subsidiaries	380,263	-246,909	-1,809,926
Convertible bond buyback loss			-8,466
Other income/(loss)	8,434	-59,599	371,297
(Loss)/income before income taxes	423,771	-429,280	-1,662,257
Net (loss)/income	423,771	-429,280	-1,662,257
Less: fair value of warrants in excess of net proceeds of equity offering		44,396
Net (loss)/income attributable to JA Solar's ordinary shareholders	423,771	-473,676	-1,662,257

Additional_information_condens3

Additional information - condensed financial statements of the Company (Details 2) (CNY)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	2,155,009	2,119,740	3,031,462	3,889,092
Other current assets	713,763	536,134
Total current assets	8,600,503	6,352,033
Investments in subsidiaries	13,524	48,802
Total assets	14,483,778	11,881,694
Current liabilities:
Derivatives liabilities - warrants	105,785	31,106
Total current liabilities	6,580,086	5,040,884
Derivatives liabilities - warrants		154,259
Total liabilities	9,016,910	7,177,615
Shareholders' equity :
Ordinary shares (US$0.0001 par value; 500,000,000 shares authorized, 227,499,837 and 252,301,917 shares issued and outstanding as of December 31, 2013 and December 31, 2014)	186	170
Additional paid-in capital	5,638,703	5,327,177
Accumulated deficit	-726,610	-1,123,724
Accumulated other comprehensive income	11,086	6,489
Total shareholders' equity attributable to JA Solar Holdings	5,360,172	4,620,262	4,892,824	6,548,669
Total liabilities and shareholders' equity	14,483,778	11,881,694
JA Solar Holdings Co., Ltd.
Current assets:
Cash and cash equivalents	29,223	34,293	17,011	77,009
Other receivable from subsidiaries		244,772
Other current assets	2,257	3,631
Total current assets	31,480	282,696
Investments in subsidiaries	2,978,282	2,579,236
Amount due from subsidiaries	2,566,506	2,557,138
Total assets	5,576,268	5,419,070
Current liabilities:
Other payables to subsidiaries and employees	6,364	7,788
Accrued and other liabilities	11,454	3,611
Derivatives liabilities - warrants	105,785	31,106
Total current liabilities	123,603	42,505
Long-term amount due to subsidiaries	92,493	602,044
Derivatives liabilities - warrants		154,259
Total liabilities	216,096	798,808
Shareholders' equity :
Ordinary shares (US$0.0001 par value; 500,000,000 shares authorized, 227,499,837 and 252,301,917 shares issued and outstanding as of December 31, 2013 and December 31, 2014)	186	170
Additional paid-in capital	5,638,703	5,327,177
Accumulated deficit	-289,803	-713,574
Accumulated other comprehensive income	11,086	6,489
Total shareholders' equity attributable to JA Solar Holdings	5,360,172	4,620,262
Total liabilities and shareholders' equity	5,576,268	5,419,070

Additional_information_condens4

Additional information - condensed financial statements of the Company (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet
Ordinary shares, par value (in dollars per share)	$0.00	$0.00
Ordinary shares, shares authorized	500,000,000	500,000,000
Ordinary shares, shares issued	252,301,917	227,499,837
Ordinary shares, shares outstanding	252,301,917	227,499,837
JA Solar Holdings Co., Ltd.
Condensed Balance Sheet
Ordinary shares, par value (in dollars per share)	$0.00	$0.00
Ordinary shares, shares authorized	500,000,000	500,000,000
Ordinary shares, shares issued	252,301,917	227,499,837
Ordinary shares, shares outstanding	252,301,917	227,499,837

Additional_information_condens5

Additional information - condensed financial statements of the Company (Details 4) (CNY)	0 Months Ended	1 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Aug. 14, 2013	31-May-13	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net (loss)/income			446,650	-426,492	-1,662,257
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense			16,281	9,401	33,225
Share of loss/(income) from subsidiaries			441	2,108	43,501
Amortization of deferred issuance cost and accretion of convertible notes				35,030	135,725
Change in fair value of derivatives			-84,484	51,867	11,485
Exchange loss/(income)			-850	-261	13,004
Loss from senior convertible notes buyback					8,466
Gain on sale of claim against loaned shares					-369,153
Changes in operating assets and liabilities:
Decrease /(increase) in other current assets			-167,030	256,591	34,516
(Decrease)/increase in interest payable				-4,123	-3,746
Net cash provided by operating activities			526,169	1,464,677	8,622
Cash flows from investing activities:
Loans granted to subsidiaries			40,000	40,000
Net cash used in investing activities			-1,372,766	-613,980	-629,974
Cash flows from financing activities:
Repayment of convertible notes		-723,742		-740,027
Proceeds from sales of claim against loaned shares					369,153
Proceeds from issuance of ordinary shares	128,529			128,529
Proceeds from issuance of ordinary shares upon exercise of warrants			286,747	143,107
Repurchase of ADS					-15,276
Proceeds from exercise of stock options			2,171	3,389
Net cash provided by/(used in) financing activities			877,269	-1,771,926	-232,961
Effect of exchange rate changes on cash and cash equivalents			4,597	9,507	-3,317
Net increase/(decrease) in cash and cash equivalents			35,269	-911,722	-857,630
Cash and cash equivalents at the beginning of the year			2,119,740	3,031,462	3,889,092
Cash and cash equivalents at the end of the year			2,155,009	2,119,740	3,031,462
JA Solar Holdings Co., Ltd.
Cash flows from operating activities:
Net (loss)/income			423,771	-429,280	-1,662,257
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense			4,985	1,960	2,055
Share of loss/(income) from subsidiaries			-380,263	246,909	1,809,926
Amortization of deferred issuance cost and accretion of convertible notes				35,030	135,725
Change in fair value of derivatives			-74,014	51,074	-32
Exchange loss/(income)			-11,636	85,032	4,422
Loss from senior convertible notes buyback					8,466
Gain on sale of claim against loaned shares					-369,153
Changes in operating assets and liabilities:
Decrease /(increase) in other current assets			1,374	1,651	-3,227
Increase/ (decrease) in other payables to subsidiaries and employees			-1,424	1,216
(Decrease)/increase in accrued and other liabilities			7,843	-10,978	-33,728
(Decrease)/increase in interest payable				-4,123	-3,746
Net cash provided by operating activities			-29,364	-21,509	-111,549
Cash flows from investing activities:
Loans granted to subsidiaries					-12,349
Loans repayment by subsidiaries			244,772	133,458	125,710
Net cash used in investing activities			244,772	133,458	113,361
Cash flows from financing activities:
Proceeds from long-term loan from subsidiaries				623,759	211,193
Repayment of convertible notes				-740,027	-617,937
Proceeds from sales of claim against loaned shares					369,153
Proceeds from issuance of ordinary shares				128,529
Proceeds from issuance of ordinary shares upon exercise of warrants			286,747	143,107
Repurchase of ADS					-15,276
Repayment of long-term loan from subsidiaries			-509,571	-253,629	-12,571
Proceeds from exercise of stock options			2,171	3,389
Net cash provided by/(used in) financing activities			-220,653	-94,872	-65,438
Effect of exchange rate changes on cash and cash equivalents			175	205	3,628
Net increase/(decrease) in cash and cash equivalents			-5,070	17,282	-59,998
Cash and cash equivalents at the beginning of the year			34,293	17,011	77,009
Cash and cash equivalents at the end of the year			29,223	34,293	17,011