(1) If the Trademark Office is declared invalid ex officio (absolute reason), the parties concerned may apply to the Trademark Review and Adjudication Board for reexamination. (2) Absolute reasons for invalidation of the Trademark Review and Adjudication Board: the subject is not limited, and the time limit is not limited; (3) The Trademark Review and Adjudication Board declared it invalid for relative reasons: the prior obligee or interested party filed an application within five years from the date of registration of the disputed trademark, and the well-known trademark registered in bad faith was not limited by the five-year period. The absolute reasons for the invalidity of the R trademark include: the registered trademark does not have visibility, distinctiveness and legitimacy, and can be declared invalid. In addition, "obtaining registration by deception or other improper means" is also a reason why the trademark is invalid. The relative reasons for the invalidity of R trademark include: the reason for the relative invalidity of trademark right is that the trademark right conflicts with the rights obtained in advance or other legitimate rights and interests. Mainly includes: invalid due to conflict with others' prior rights; It is invalid because it infringes on the rights of other people's well-known trademarks; Invalid because others have not registered a trademark; Invalid due to violation of agency or representative regulations.