Trademark opposition requires the following documents: (1) Trademark opposition application; (2) Clear request and factual basis, accompanied by relevant evidence materials; (3) A copy of the preliminary approval announcement of the opposed trademark ; (4) Proof of identity of the opponent. (5) If you entrust a trademark agency to handle trademark opposition applications, you must also submit a trademark agency power of attorney. Article 24 of the "Regulations on the Implementation of the Trademark Law of the People's Republic of China" raises an objection to a trademark that has been preliminarily reviewed and announced by the Trademark Office, the opponent shall submit the following trademark objection materials to the Trademark Office in duplicate and mark the original and copy. : (1) Application for trademark opposition; (2) Identity certificate of the opponent; (3) Violation of Article 13, paragraphs 2 and 3, Article 15, Article 16, paragraph 1, of the Trademark Law If an objection is raised on the grounds specified in Articles 30, 31, and 32, the opponent must prove that he is a prior right holder or an interested party. The trademark opposition application should have clear requests and factual basis, and should be accompanied by relevant evidence materials.