1. Generally, the lawsuit shall be conducted in written form, stating the relevant information and providing relevant evidence, such as the name and address of the alleged infringement, the place where the alleged infringement occurred, the trademark logo or articles (photos and copies) suspected of infringement, etc. At the same time, the complainant can also complain to the administrative department for industry and commerce by telephone. 2. If a registrant complains to the administrative department for industry and commerce and requests to protect his exclusive right to use a trademark, he shall submit a written complaint application, and attach his own valid certification materials, including: 1. A complaint (including the object of complaint, complaint matters and requirements, and the contact information of the obligee or complainant). The second is the right status of the trademark owner (trademark registration certificate). The third is the actual use picture of the trademark (including the actual use picture of the obligee's own trademark and the actual use picture of the respondent's commodity trademark). Fourth, foreign-related trademarks, should be issued in accordance with the provisions of the corresponding notarization certification materials. Fifth, the administrative department for industry and commerce may require the obligee (including authorized agents) to provide expert opinions on whether the goods involved are products produced or licensed by the obligee.