Where do you want to apply for China visa? in USA or Nigeria? Do you want to apply for Tourist Visa or Business Visa?
As I know, the procedures for China visa application in Negeria are:
Stage One: Appointment

The applicant (or someone on behalf) may come to the Embassy every Monday, Wednesday or Friday (9am-17pm) with complete visa application documents required, for appointment of interview.

Stage Two: Interview

The applicant himself or herself, except the holders of diplomatic or official passports, should come to the embassy for interview, in line with the appointment. He or she who fails the interview will be turned down; Submission of fake documents may result in restriction in entering China in the future. However, to pass the interview does not necessarily mean that the applicant could finally get a visa.

Stage three: Collection

The applicant (or someone on behalf) may come to the embassy with the pick-up form to check the final result, on the pick-up date specified in the form (usually in 1 or 2 weeks after the interview). He or she who is granted visa should pay the visa fee with ATM card or debit card in the visa hall, and then pick up his or her passport with visa. He or she who is not granted visa would get back the passport directly without paying any fee.