1. Enter CNCA on Baidu, find its official website, and click Enter.
2. After the page jumps, go to the website and click Internet Plus Services at the top.
3. After the page jumps, click the authentication result to enter.
4. Enter the certificate number and institution name in the query page that appears, and click the query button.
5. At this time, you can see the information of the testing organization at the bottom of the query page, and click its organization name to enter.
6. After the page jumps, you can see the CMA certificate information of the detection structure. If the current certificate expires, continue to click this item to enter.
7. You can view CMA certificate changes and other details in the page that appears.