1) Baidu "China Trademark Network"---open the trademark query page---enter the category number, Chinese characters or English query, enter the query content---click approximate query.

2) You also need to determine which category your product or service belongs to, for example: computers and mobile phones belong to category 9; clothing belongs to category 25; etc. .

3) It is recommended that you check with an agency. They are more professional, but your own query may not be very accurate.

---For inquiries, you can leave a message to me and I can help you inquire for free.