<PAGE>
                                                                    EXHIBIT 12.1

                  CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
                         PURSUANT TO SECTION 302 OF THE
                           SARBANES-OXLEY ACT OF 2002


         I, Yonghua Lu, Chief Executive Officer of Solarfun Power Holdings Co.,
Ltd., certify that:

         1.       I have reviewed this annual report on Form 20-F of Solarfun
                  Power Holdings Co., Ltd.;

         2.       Based on my knowledge, this report does not contain any untrue
                  statement of a material fact or omit to state a material fact
                  necessary to make the statements made, in light of the
                  circumstances under which such statements were made, not
                  misleading with respect to the period covered by this report;

         3.       Based on my knowledge, the financial statements, and other
                  financial information included in this report, fairly present
                  in all material respects the financial condition, results of
                  operations and cash flows of the company as of, and for, the
                  periods presented in this report;

         4.       The company's other certifying officers and I are responsible
                  for establishing and maintaining disclosure controls and
                  procedures (as defined in Exchange Act Rules 13a-15(e) and
                  15d-15(e)) for the company and have:

                  (a)      Designed such disclosure controls and procedures, or
                           caused such disclosure controls and procedures to be
                           designed under our supervision, to ensure that
                           material information relating to the company,
                           including its consolidated subsidiaries, is made
                           known to us by others within those entities,
                           particularly during the period in which this report
                           is being prepared;

                  (b)      [omitted pursuant to the guidance of Release No.
                           33-8238 (June 5, 2003), Release No. 33-8392 (February
                           2, 2004) and Release No. 33-8545 (March 2, 2005)];

                  (c)      Evaluated the effectiveness of the company's
                           disclosure controls and procedures and presented in
                           this report our conclusions about the effectiveness
                           of the disclosure controls and procedures, as of the
                           end of the period covered by this report based on
                           such evaluation; and

                  (d)      Disclosed in this report any change in the company's
                           internal control over financial reporting that
                           occurred during the period covered by the annual
                           report that has materially affected, or is reasonably
                           likely to materially affect, the company's internal
                           control over financial reporting; and

         5.       The company's other certifying officers and I have disclosed,
                  based on our most recent evaluation of internal control over
                  financial reporting, to the company's auditors and the audit
                  committee of company's board of directors (or persons
                  performing the equivalent functions):

                  (a)      All significant deficiencies and material weaknesses
                           in the design or operation of internal control over
                           financial reporting which are reasonably likely to
                           adversely affect the company's ability to record,
                           process, summarize and report financial information;
                           and

                  (b)      Any fraud, whether or not material, that involves
                           management or other employees who have a significant
                           role in the company's internal control over financial
                           reporting.




                                         By:/s/ Yonghua Lu
                                            ------------------------------
                                            Yonghua Lu
                                            Chairman and Chief Executive Officer
                                            June 30, 2007