1. Confirm that the account number and password are entered correctly. Please confirm whether the account number and password you entered are correct. You can try to re-enter or reset your password using the password retrieval function.

2. Confirm whether the network connection is normal. Use other websites or software to test whether the Internet connection is normal, or try to log in using other networks to determine whether network problems affect login.

3. Clear the browser cache and Cookies. Clear the browser cache, cookies or try to use another browser to avoid problems such as browser cache and cookies affecting website login.

It should be noted that when logging in to the website of the Open University of China, you must visit the official website to avoid affecting your login or account security due to problems with unofficial websites.