Trademark Transfer Network reminds everyone that in order to avoid being revoked, it is necessary to keep the use evidence in the process of trademark use. In case of trademark disputes in the later stage, these evidences are very useful. Then the question comes, which use evidences are useful? 1, the use of contracts or agreements, contracts and agreements are obvious traces of use and as a very important means of discrimination. In the process of trademark use, receipts in the process of buying and selling goods and contracts signed during cooperation are all favorable evidence, and it is necessary to keep some of these evidences. 2. There is no doubt about the invoice. As a basic commercial voucher in economic exchanges, the invoice is a written proof of recording business activities, and it is a receipt and payment voucher issued and collected in the purchase and sale of goods, provision or acceptance of services and other business activities. Therefore, a true and effective invoice for the sale of goods or the provision of services can strongly prove the use of registered trademarks. Here, we mainly consider that some enterprises leave the commodity name without the trademark name when issuing invoices. This requires the attention of business owners, and only those with trademark marks are effective. 3, packaging bags, cartons and other products packaging bags or printed words on cartons are also valid evidence. 4. Advertising articles such as brochures, televisions, newspapers and other advertising articles are very favorable evidence. The main evidence is the above categories, and the preservation of trademark use evidence is very important. Many notices that everyone owns a trademark are also recommended to be kept.