Hi 孙畅 孙,
由于我的母语不是中文,所以我将用英语回答这个问题。
The Anitvirus software, VPN, Proxy settings, Firewall or incorrect Date and Time is preventing the MathWorks Installer and/or Activation Client from connecting to the MathWorks servers.
Please refer to the following MATLAB answer for information about this issue, the cause for it and the troubleshooting steps for the same:
Hope this helps!