MEMSIC (MEMS) 10-Q 2009 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of MEMSIC, Inc. (the “Company”) on Form 10-Q for the period ending September 30, 2009 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Yang Zhao, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(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.

/s/ YANG ZHAO

Yang Zhao

Chief Executive Officer

November 13, 2009

This Certification shall not be deemed part of the Report or incorporated by reference into any of the Company’s filings with the Securities and Exchange Commission by implication or by any reference in any such filings to the Report.