What type of documents need for Chinese visa? Please let me know.

You have to provides the following documents:
1. your original passport remaining to be valid for at least six months from the date of application with at least 2 blank visa pages.
2. One completed Visa Application Form with a recently-taken colorful passport photo stuck on it.
3. an Invitation Letter of Duly Authorized Unit or Confirmation Letter of Invitation issued by the authorized Chinese unit such as Chinese government departments, companies and social organizations authorized by the Chinese Foreign Ministry.