The special straw cover for trademark agency of a trademark registration company has legal effect in the contract. The special seal for trademark registration agency is a necessary tool for trademark registration service agencies to provide trademark registration services, and the use of the special seal for trademark registration is one of the powers of trademark agents. Trademark agents have a special management, use and storage system for the special seal used in the agency contract when acting as an agent for trademark registration, and the special seal has been standardized and filed. Therefore, in the process of trademark registration service, the use of the special seal for trademark agency has legal effect, which can effectively prove the legitimacy and effectiveness of related acts.