Tools: computer, browser.

1. Login to enter the "National Vocational Skills Appraisal Information Query Platform" page.

2. Enter "Secondary Builder" in the search box at the top of the page and select "Professional Qualification Certificate Inquiry".

3. Enter the certificate number and name in the "Vocational Qualification Certificate Inquiry" page, and click "Inquiry" button.

4. The query results will show the basic information of the certificate, including certificate number, name, gender, date of birth, date of issuance, validity period, etc.

5. If the certificate has expired or you need to continue education in Erjian, the query result page will display corresponding prompt information to remind the holder to continue education in Erjian.