Apply for evidence preservation. According to the "People's Republic of China (PRC) Civil Procedure Law", when filing a trademark infringement lawsuit, it is necessary to collect the evidence of the other party's infringement and do a good job of notarization. If there is no notarization, you may apply to the people's court for evidence preservation. The Civil Procedure Law of People's Republic of China (PRC) is based on the Constitution and combined with the experience and actual situation of civil trial in China.