Category 1: Trademark ownership, usually the trademark registration certificate. Category 2: Facts of trademark infringement, generally including notarial certificates, lawyer letters, etc. Category 3: Evidence materials to determine the amount of compensation, generally including advertisements. Contracts, agency contracts and invoices, etc. The first is the existing rights certification documents of the infringed party, such as: trademark registration certificate, patent certificate, copyright registration certificate, award certificate related to the case, etc. These documents are mainly textual evidence. The second is physical evidence, that is, the product samples of the infringed party and the infringing product samples. The last step is to prove the purchase of the infringing product involved in the lawsuit. It mainly refers to the purchase invoice, which needs to show the name of the infringing product, place of purchase, product price, signature of the seller, etc.