What are the requirements for visa application?

You should apply for a M type. The required documents are:
1. filled 2013 application form and a recent passport size photo.
2. copy of your passport information page.
3. invitation letter from the duly authorized Chinese entity or unit.
4. invitation letter from your Chinese business partner.
5. an introduction letter from your company.
6. a copy of your company's business license.
7. bank statement in recent months. You should have 4 million Naira in your account.
8. other required documents.

By the way, you should make appointment before you submit your materials from 15:00 to 17:00 on every Tuesday and Thursday.