1. First, search and open the official website of Ministry of Human Resources and Social Security in the mobile browser, and enter "professional qualification certificate inquiry" in the search box to enter this page.

2. Secondly, select the "Vocational Qualification Certificate Inquiry" option on the left side of the page, and click "Enter" according to the prompt.

3. Finally, enter the name and number of the certificate to be queried on the query page, and click the "Query" button.