You need a business visa to China. You need an Original Visa Notice Sheet from an authorized governmental/apparatus /organization in China prescribing the visa validity, number of entries and stay period; An invitation letter from the company/organization/institution you want to visit inChina;
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/organization/ institution
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