According to Article 3 of the Provisions on the Recognition and Protection of Well-known Trademarks, the following materials can be used as evidential materials to prove that a trademark is well-known:

(1) Relevant materials to prove the public's awareness of the trademark;

(2) relevant materials proving the duration of the use of the trademark, including the history and scope of the use and registration of the trademark;

(3) relevant materials proving the duration, degree and geographical scope of any publicity work of the trademark, including the way of advertising and promotion activities, geographical scope, types of publicity media, advertising volume and other relevant materials;

(4) relevant materials proving that the trademark is protected as a well-known trademark, including relevant materials that the trademark was protected as a well-known trademark in China or other countries and regions;

(5) other evidential materials to prove that the trademark is well-known, including the output, sales volume, sales revenue, profits and taxes, sales area and other relevant materials of the main commodities using the trademark in recent three years.

It is troublesome to apply for well-known recognition. It is recommended to find a trademark agency. If you are in Chengdu, you can find a local trademark agency to help you apply for trademark registration.