168




                                  EXHIBIT 32.2
                                  ------------



           This is an Exhibit to the Form 20-F of Sinovac Biotech Ltd.
           -----------------------------------------------------------


                     Attached find the following materials:


               Certification of Lily Wang pursuant to Section 906
               --------------------------------------------------
                        of the Sarbanes-Oxley Act of 2002
                        ---------------------------------


                               End of Exhibit 32.2

                                   -----------






                                       169




                            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 Annual Report on Form 20-F for fiscal year ended December
31, 2003 of Sinovac Biotech Ltd., a company  organized under the laws of Antigua
and  Barbuda  (the  "Company"),  as  filed  with  the  Securities  and  Exchange
Commission  on the date  hereof  (the  "Annual  Report"),  I, Lily  Wang,  Chief
Financial Officer of the Company certify,  pursuant to 18 U.S.C. Section 1350 as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

2.   The  information  contained in the Annual  Report fairly  presents,  in all
     material respects, the financial condition and results of operations of the
     Company.


Dated: June 30, 2004                    /s/ Lily Wang
                                        ---------------------------
                                        Lily Wang, Chief Financial
                                        Officer and Director