Legal analysis: There is no issue with the validity period of a well-known trademark, and it can also be said to be permanent. There is no accurate concept of the protection period of a well-known trademark, because the validity period of a trademark after registration is 10 years, even if it is a well-known trademark Trademarks need to be renewed after 10 years. If they are not renewed upon expiration, the well-known trademark will also be cancelled. Others can also apply for the trademark again.

Legal basis: "Trademark Law of the People's Republic of China" Article 39 The validity period of a registered trademark is ten years, calculated from the date of approval of registration.