Hi. I am marrying a chinese lady in Guangzhou. I have a single certificate and divorce certificate.

Yes, you need to get the Single Certificate and Divorce certificate authenticated by China Consulate in Sydney.

You are required to prepare the following documents before lodging the application with Chinese Consulate in Sydney:

1) One properly filled-in and duly signed application form for authentication.

2) A Single Status Certificate obtained from NSW Registry of Births, Deaths and Marriages and authenticated by the Department of Foreign Affairs and Trade (DFAT) NAW State Office and its duplicate.

3) The Decree Nisi issued by the Family Court of Australia and authenticated by DFAT NSW State Office and its duplicate. Those divorced in Australia whose former spouse is a Chinese citizen shall apply to a competent court in China to have the Decree Nisi recognized after the authentication by the Consulate. Therefore, the applicant divorced with a non-Chinese citizen shall provide a certificate in relation to the nationality of his/her former spouse and the duplicate copy.

4) Proof of identity with photo (such as valid passport) and its duplicate.