Legal analysis: Documents and materials required for trademark revocation review: 1. "Trademark Agency Power of Attorney": If you entrust a trademark agency to act as an agent, you must provide a power of attorney stamped with the applicant's seal. Applicants from outside mainland China who want to apply for trademark review in China must entrust a trademark agency to do so. 2. Various types of re-examination applications: If you entrust an agency to apply for trademark re-examination, the agency will prepare it. 3. Ruling on review of reasons and evidence materials: The Trademark Review and Adjudication Board will make a final ruling on approval or disapproval of registration for registration rejection review or objection review, and will notify the relevant parties in writing. The Trademark Review and Adjudication Board will make a final decision on maintaining or revoking the trademark for other reviews and notify the relevant parties in writing.

Legal basis: Article 54 of the Trademark Law of the People's Republic of China

If the party concerned is dissatisfied with the Trademark Office's decision to cancel or not to cancel a registered trademark, You can apply to the Trademark Review and Adjudication Board for review within fifteen days from the date of receipt of the notice. The Trademark Review and Adjudication Board shall make a decision within nine months from the date of receipt of the application and notify the parties in writing. If there are special circumstances that require an extension, it can be extended for three months with the approval of the industrial and commercial administration department of the State Council. If the party concerned is dissatisfied with the decision of the Trademark Review and Adjudication Board, it may file a lawsuit with the People's Court within thirty days from the date of receipt of the notice.