You may need the following documents:
1. A duly-completed visa application form and Declaration form, together with two recent passport photos;
2. Your passport copy---Bio-data pages;
3. Proof of adequate funds to cover the duration of your stay, for example your bank statement.
For exact answer, you can contact the commissioner's office of China 's foreign ministry in HK SAR.
Tel- Enquiry: 852-34132424 (available at 10:00-11:00am, 3:00-4:00pm on workdays)
Fax: 852-34132312
Email: mfa.gov.cn|fmcovisa_hk