what are the documents required to get a business visa for mainland china?

Requirements for China business visa are as follows:
1. The original passport with at least six-month validity and two blank visa pages, one photocopy of the passport page containing the personal particulars.
2. Truly completed and signed Visa Application Form of the People's Republic of China.
3. Invitation Letter of Duly Authorized Unit issued by the authorized government departments/companies/units in China, or formal Invitation Letter issued by renowned and creditable companies/units in China.
4. Visa recommendation letter from the applicant's employing company, organization, etc.
5. Other additional documents required according to the merits of each applicant, e.g. bank statements, round-trip air tickets booking, etc.