6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

REPORT OF FOREIGN ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of August, 2009

__________

Commission File Number: 001-32371

__________

SINOVAC BIOTECH LTD.

39 Shangdi Xi Road

Haidian District

Beijing 100085, People’s Republic of China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F X               Form 40-F  _______

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):________________

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):________________

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  _______             No X      

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

82- N/A      

SINOVAC BIOTECH LTD.

Form 6-K

TABLE OF CONTENTS

	Page
Signature	3
Exhibit 99.1 – Press Release	4

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SINOVAC BIOTECH LTD.
	By:	/s/ Weidong Yin
		Name:   Weidong Yin
		Title:     Chief Executive Officer, President
Date:  August 10, 2009

EX-99.1

Exhibit 99.1

Sinovac to Host Conference Call to Report 2009 Second Quarter Financial Results

BEIJING, Aug. 11 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE Amex: SVA), a leading provider of vaccines in China, today announced that it will host a conference call on Wednesday, August 19, 2009 at 8:00 a.m. ET to review the Company's second quarter financial results for the period ended June 30, 2009 and provide an update on recent corporate developments.

To access the conference call, please dial 1-877-407-4018 (USA) or 1-201-689-8471 (international). A replay of the call will be available from 11:00 a.m. ET on August 19, 2009 to September 2, 2009 at midnight. To access the replay, please dial 1-877-660-6853 (USA) or 1-201-612-7415 (international) and reference the account number 3055 and the access code 330444.

A live audio webcast of the call will also be available from the Investors section on the corporate web site at http://www.sinovac.com . A webcast replay can be accessed on the corporate website beginning August 19, 2009 and the replay will remain available for 30 days.

About Sinovac

Sinovac Biotech Ltd. is a China-based biopharmaceutical company that focuses on the research, development, manufacture and commercialization of vaccines that protect against human infectious diseases. Sinovac's commercialized vaccines include Healive® (hepatitis A), Bilive® (combined hepatitis A and B), and Anflu® (influenza). Panflu(TM), Sinovac's pandemic influenza vaccine (H5N1), has already been approved for government stockpiling. Sinovac is developing vaccines for Enterovirus 71, Universal Pandemic Influenza, Japanese encephalitis vaccine, and Human Rabies vaccine. Its wholly-owned subsidiary, Tangshan Yian, is conducting field trials for independently developed inactivated animal rabies vaccines.

   For more information, please contact:

    Contact Information:

     Helen G. Yang

     Sinovac Biotech Ltd.

     Phone: +86-10-8289-0088 x871

     Fax:   +86-10-6296-6910

     Email: info@sinovac.com

   Investors:

     Amy Glynn/Sara Ephraim

     The Ruth Group

     Tel:   +1-646-536-7023/7002

     Email: aglynn@theruthgroup.com

                 sephraim@theruthgroup.com

   Media:

     Janine McCargo

     The Ruth Group

     Tel:   +1-646-536-7033

     Email: jmccargo@theruthgroup.com