You can take evidence yourself or entrust a professional lawyer to take evidence: 1. Proof of the prior rights of the infringed. (including trademark registration certificate, patent certificate, copyright registration certificate, award-winning certificate related to the case, etc.). ) 2. Product samples of the infringer. 3. Samples of infringing products. 4. Proof of purchasing infringing products. Here mainly refers to the purchase invoice. The invoice must indicate the name of the infringing product, the place where the infringing product was purchased, the price of the infringing product, the name of the seller and other matters. In a trademark infringement case, the infringer promises to stop the infringement. If the infringement has caused damage to the trademark owner, civil compensation is needed. Of course, if the circumstances of trademark infringement itself have reached a serious level and constitute a crime according to the provisions of the criminal law, then it is necessary to investigate the criminal responsibility of the infringer. It should be noted that trademark infringement does not necessarily involve criminal responsibility. The key is to see whether the specific infringement is suspected of constituting a crime.