If a trademark infringement receives a letter from a lawyer, the parties may negotiate with the trademark registrant and his lawyer on the way to bear the tort liability and strive to reach an agreement; You can also attend the trial on time after the other party takes litigation measures and bear the responsibility according to the judgment of the court. According to the provisions of paragraphs 1 and 3 of Article 60 of the Trademark Law, if one of the acts listed in Article 57 of this Law infringes on the exclusive right to use a registered trademark and causes disputes, the parties concerned shall settle the dispute through consultation; Unwilling to negotiate or failing to negotiate, the trademark registrant or interested party may bring a lawsuit to the people's court, or request the administrative department for industry and commerce to handle the dispute over the amount of compensation for infringement of the exclusive right to use a trademark. If no agreement is reached through mediation by the administrative department for industry and commerce, or if the mediation agreement is not fulfilled after it takes effect, the parties concerned may request the administrative department for industry and commerce to mediate, or bring a lawsuit to the people's court in accordance with the Civil Procedure Law. The legal basis for the parties to bring a lawsuit to the people's court in accordance with the Civil Procedure Law: Article 60 of the Trademark Law of People's Republic of China (PRC) has one of the acts of infringing on the exclusive right to use a registered trademark listed in Article 57 of this law, and if a dispute arises, it shall be settled by the parties through consultation; Unwilling to negotiate or if negotiation fails, the trademark registrant or interested party may bring a lawsuit to the people's court, or request the administrative department for industry and commerce to handle it, and if the infringement is established, it shall be ordered to immediately stop the infringement, confiscate and destroy the infringing goods and tools mainly used to manufacture infringing goods and forge registered trademark marks. If the illegal business amount is more than 50 thousand yuan, a fine of less than five times the illegal business amount may be imposed. If there is no illegal business amount or the illegal business amount is less than 50 thousand yuan, a fine of less than 250 thousand yuan may be imposed. Whoever commits trademark infringement twice or more within five years, or has other serious circumstances, sells goods that knowingly infringe the exclusive right to use a registered trademark, and shall be given a heavier punishment. If it can prove that the goods are legally obtained by itself and explain to the supplier, the administrative department for industry and commerce shall order it to stop selling.