Siliconware Precision Industries (SPILA) 20-F 2011 FY Annual report (foreign)

Exhibit 13.1

CERTIFICATION OF PERIODIC FINANCIAL REPORT

Pursuant to 18 U.S.C. Section 1350

In connection with the Annual Report of Siliconware Precision Industries Co., Ltd. on Form 20-F for the year ended December 31, 2011 as filed with the SEC on the date hereof, I, Chi-Wen Tsai, the Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the report fairly presents, in all material respects, the financial condition and results of operations of the company.

Date: April 26, 2012

By:	/s/ Chi-Wen Tsai
Name:	Chi-Wen Tsai
Title:	Chief Executive Officer

* A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the company and will be retained by the company and furnished to the SEC or its staff upon request.