Apply for evidence preservation. According to the "Civil Procedure Law of the People's Republic of China", when filing a lawsuit for trademark infringement, it is necessary to collect the other party's infringement evidence and notarize it. If there is no notarization, you can apply to the People's Court for evidence preservation. The Civil Procedure Law of the People's Republic of China is based on the Constitution and combined with the experience and actual situation of my country's civil trial work.