You need a business visa to China. The requirements are as follows:
1. Invitation letter from an authorized governmental apparatus /organization in China prescribing the visa validity, number of entries and stay period;
2. Fully completed Visa Application Form in Chinese or English, attached with one recent color.
3. Original passport with validity more than six months and minimum 2 blank visa pages;
4. Photocopy of the first 2 pages (personal information) of the passport and the recent Chinese visa page if there is any;
5. Invitation letter from the company you want to visit in China;

If this is your first visit to China, it is recommended that following documents are also prepared in case of necessity:
1. Your income certificate/up-to-date Personal Bank Statement
2. Your company's Registration Certificate (photocopy)
3. A recommendation letter from your company
4. A recommendation letter from Chamber of Commerce& Industry
5. Your Tax Payment Receipt for last year (photocopy)
6. Your Character Certificate/Police Clearance Certificate