(1) Analyze the reasons, check the application for invalidation of a trademark, analyze the reasons and evidence of the applicant's invalidation, and submit the written defense reasons and corresponding evidence materials in a targeted manner. If the respondent does not understand the invalidation of a trademark, it is suggested to seek help from the trademark agency in time. (II) Prepare the defense materials and evidence. It is suggested that the respondent put the bound defense documents in the following order. The specific list of defense materials for invalidation is as follows: (in duplicate) 1. The Defense for Invalidation; 2. Catalogue of defense materials; 3. Power of Attorney for Trademark Agency; (If you need to prepare for the entrusted agency, you don't need to prepare for it yourself.) 4. Copy of the announcement page of the preliminary examination and approval of the dispute and the registration announcement page; 5, evidence list and evidence materials; 6. The original notice of invalidation of the Trademark Committee and the envelope sent by the Trademark Review and Adjudication Board. Note: If the respondent needs to submit a defense for invalidation and has supplementary evidential materials, it shall make a statement in the defense and submit it within 3 months from the date of submitting the defense; Failure to submit it at the expiration of the time limit shall be deemed as giving up the supplementary evidence materials. (III) Submitting a written defense to the Trademark Office. The respondent shall submit a written defense and corresponding evidence to the Trademark Office within 3 days from the date of receiving the notice of defense for invalidation and a copy of the application for invalidation. (IV) The Trademark Review and Adjudication Board makes a ruling. After listening to the statements of the parties and looking at relevant evidence, the Trademark Review and Adjudication Board will make a ruling on maintaining the registered trademark or declaring it invalid. If a party refuses to accept the ruling of the Trademark Review and Adjudication Board, it may bring a suit in a people's court within 3 days from the date of receiving the notice.