Registered trademarks protect the exclusive right of trademarks to prevent other companies from preemptively registering in other categories of trademarks. According to the relevant provisions of the Trademark Law on the application for trademark registration, when applying for trademark registration, the applicant should determine the category of goods or services using the trademark according to the classification of goods and services classification table. If the same applicant uses the same trademark on different categories of goods, he shall apply for registration in different categories according to the classification of goods, which can not only avoid the improper expansion of the application scope of trademark rights, but also facilitate the approval of trademark examiners, and at the same time effectively protect the exclusive right to use trademarks.