Hello! I am university lecturer in Nigeria. I have been invited for a 4-day conference in Eastern N

Yes, you need to apply for the F type with the invitation letter from China. Besides, you need to prepare following documents for application:
1. Qualified original introduction letter with the full name, title, date & signature of the issuing person from applicant's company.
2. The original and one photocopy of the applicant's ID card.
3. The original and one photocopy of the certificate of incorporation of the applicant's company.
4. Hotel reservation in China and round-trip ticket between Nigeria and China;
5. Recent bank statement of account.
6. One completed application form with a recently taken passport photo stuck on.