documents and materials to be provided: 1. power of attorney for trademark agency: if a trademark agency is entrusted, a power of attorney stamped with the applicant's stamp is required. If an applicant from outside the mainland wants to apply for cancellation of not using a registered trademark for three consecutive years in China, he must entrust a trademark agency. Second, the Application for Cancellation of Not Using a Registered Trademark for Three Years in a row: If an agency is entrusted to apply for registration, it shall be made by the agency. Third, a copy of the Trademark Announcement of the registered trademark that has been revoked; And explanation of the use of the revoked trademark "Article 41 Where a registered trademark violates the provisions of Articles 1, 11 and 12 of this Law, or is registered by deception or other improper means, the Trademark Office shall revoke the registered trademark; Other units or individuals may request the Trademark Review and Adjudication Board to make a ruling on the cancellation of the registered trademark. Article 44 Where a registered trademark is used, the Trademark Office shall order it to correct or cancel its registered trademark within a time limit: (1) Changing the registered trademark by itself; (2) changing the name, address or other registered items of the registrant of a registered trademark; (3) Transferring a registered trademark by itself; (four) stop using for three consecutive years.