In step 4 of the registration process, there is an option to request visa invitation letter. Click on "YES" to the question "Do you need an invitation letter for a visa?"
- Information for visitors: http://www.border.gov.au/Trav/Visi
- Visa Options: http://www.border.gov.au/Trav/Visi
For Chinese visitors
- Australian Embassy, China: http://china.embassy.gov.au/bjngchinese/home.html
- Visitor Visa (Chinese): http://china.embassy.gov.au/bjngchinese/DIMAcn31.html