The methods include online query, agency query, official query, etc.

1. Free online trademark query system query.

2. Search the paid agency trademark search system.

3. Official inquiry (this inquiry involves submitting a trademark inquiry to the Trademark Office and entrusting an enquirer from the Trademark Office to conduct the inquiry).

Legal basis: Article 22 of the "Trademark Law" stipulates that applicants for trademark registration shall fill in the product category and product name of the trademark in accordance with the prescribed product classification table, and submit an application for registration. A trademark registration applicant can apply to register the same trademark for multiple categories of goods through one application. Trademark registration applications and other relevant documents can be submitted in writing or in the form of data messages.