EXHIBIT A

Joint Filing Agreement

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Persons (as such term is defined in the Schedule 13G referred to below) on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the common shares, par value US$0.001, of Sinovac Biotech Ltd., and that this Agreement may be included as an Exhibit to such joint filing. This Agreement may be executed in any number of counterparts, all of which, taken together, shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of November 15, 2010.

SAIF Partners IV L.P.
By:	/s/ Andrew Y. Yan
	Name:	Andrew Y. Yan
	Title:	Director of SAIF IV GP Capital Ltd., which is the General Partner of SAIF IV GP, L.P., which is the General Partner of SAIF Partners IV L.P.
SAIF IV GP, L.P.
By:	/s/ Andrew Y. Yan
	Name:	Andrew Y. Yan
	Title:	Director of SAIF IV GP Capital Ltd., which is the General Partner of SAIF IV GP, L.P.
SAIF IV GP Capital Ltd.
By:	/s/ Andrew Y. Yan
	Name:	Andrew Y. Yan
	Title:	Director of SAIF IV GP Capital Ltd.