First of all, pay attention to the collection of evidence. Only when there is sufficient evidence can the administrative law enforcement agency or the judicial trial agency determine whether a certain act is an infringement as quickly as possible. Therefore, evidence is a prerequisite that affects the handling of cases. The evidence mainly includes: 1. Documents proving the prior rights of the infringed party. 2. Product samples of the infringed party. 3. Samples of infringing products. 4. Proof of purchasing infringing products. This 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, etc. Second, after we have initially collected and sorted out the evidence, we should consult a professional agency. There are generally two ways to deal with infringement cases. Administrative investigations and litigation procedures. Third, prepare a complaint or indictment. When preparing a complaint or indictment, attention should be paid to effectively combining facts and tone to facilitate the smooth progress of the case. Legal basis: Article 60 of the "Trademark Law of the People's Republic of China" involves any of the acts that infringe upon the exclusive right to use a registered trademark as listed in Article 57 of this Law and causes a dispute, which shall be resolved by negotiation between the parties; if the party is unwilling to negotiate or If negotiation fails, the trademark registrant or interested party may file a lawsuit with the People's Court or request the industrial and commercial administration department to handle the matter. When handling the case, if the industrial and commercial administrative department determines that the infringement is established, it shall order it to immediately stop the infringement, confiscate and destroy the infringing goods and tools mainly used to manufacture infringing goods and counterfeit registered trademarks. If the illegal business turnover exceeds 50,000 yuan, it may be punished. A fine of not more than five times the illegal business volume may be imposed. If there is no illegal business volume or the illegal business volume is less than 50,000 yuan, a fine of not more than 250,000 yuan may be imposed. Those who commit more than two trademark infringements within five years or have other serious circumstances shall be severely punished. If you sell goods that are not known to infringe the exclusive rights of a registered trademark, and you can prove that you legally obtained the goods and explain the supplier, the industrial and commercial administration department will order you to stop selling them.