Legal analysis: After a registered trademark is approved, you can apply to the Trademark Review and Adjudication Board to declare the registered trademark invalid and cancel it. Within five years from the date of registration of a trademark, the prior obligee or interested party may request the Trademark Review and Adjudication Board to declare the registered trademark invalid.

Legal basis: Trademark Law of People's Republic of China (PRC).

1. The applicant knows or should know the trademark of the respondent because of its agency or representation, trade, cooperation, geography or other relationship with the respondent.

2. The respondent knows or should know the existence of prior rights of others because of the popularity of trade names, works, designs, names, portraits and other factors.

3. If the applicant claims that the respondent constitutes malicious cybersquatting, it is necessary to consider the originality of the applicant's trademark.

4. The respondent knows or should know that the names of tourist attractions and places of origin belong to public resources.

5. After the registration of the disputed trademark, the respondent, for the purpose of seeking illegitimate interests, obstructs the proper use of others, demands high transfer fees, license fees and infringement compensation from others, or conducts misleading publicity, resulting in market confusion.