how much wil it cost me from nigeria to china and the document required

Bright, the cost for visa is 5000 nairas.

The documents to be submitted include:
1. A valid passport and a photocopy of its data page;
2. A filled-out application form attached with your recent color bare-headed photo;
3, An invitation letter from a duly authorized unit;
4. An invitation letter from your business partner in China;
5. A cover letter of your company;
6. A photocopy of your company's business license;
7. A bank statement of the latest six months, with a balance less than 4 million nairas;
8. Other documents required by the consular officer.