According to the relevant provisions of the Trademark Law, complaints of trademark infringement need to submit the following written materials:

1. Complaint letter. List the respondent, address of the respondent, infringement facts, complaint requirements, legal basis, as well as the complainant’s name, address, contact number, date of complaint, and agent-related documents.

2. Business license. Copies must be submitted with the official seal of the original issuing authority.

3. Trademark registration certificate. Copies must be affixed with the official seal of the industrial and commercial administration at or above the county level where the trademark owner is located.

4. Evidence of infringement. Including infringing objects, trademarks, relevant bills or photos, etc. However, complaints under any of the following circumstances will not be accepted:

1. The respondent is unclear.

2. The facts of the infringement complained of are unclear.

3. The complaint documents provided are incomplete and have not been completed within three days.

4. Beyond the regional jurisdiction of the industrial and commercial administration at the same level.

5. The complainant has filed a civil lawsuit with the People's Court regarding the same fact.