The fee for single entry visa: 5000 Naira
You can apply for business visa to attend the conference, requirements for Business Visa Application,
- Current passport with at least 6 months of validity and at least one blank visa page.

- One completed and signed Visa Application Form (BG-01) with one additional passport photo (black & white or colored).

- Invitation from a Chinese company or other organization. No fax, photocopy or scanned invitation letter is accepted. The invitation letter is only valid for 3 months from the date of issuance.

as for the procedures and more useful information, please refer to http://lagos.chineseconsulate.org/eng/lszj/zgqz/t625001.htm;
http://lagos.chineseconsulate.org/eng/lszj/zgqz/t624999.htm