To apply for a business visa, you need an invitation letter from China. Contact your business partner first for that.

may i know other requirements plz for bussiness visa?

other requirements for F visa should be as follows:
1.completed visa application form with a recently taken passport photo stuck on it;
2. One formal introduction letter from your company to tell your identity， the purpose of visit to China, and supposed duration of stay in China.
3. The original and one photocopy of your ID card.
4. The original and one photocopy of your certificate of incorporation.
5. Hotel reservation in China and round-trip ticket between Nigeria and China.
6. Recent bank statement of account.
7. Photocopy of your passport data page and all the Chinese visas (if any).

How I can get visa business China

If you want to apply for Chinese business M type, you should first prepare the required documents including passport and the copy, the filled-out application form, a passport-style photo, and an invitation letter from the Chinese business partner. Next, submit the application to the China embassy in Djibouti.