1. Open your MATLAB（If your license has already expired, go to step 4）。

2. If you are already using SJTU MATLAB license，selectHelp - Licensing - Update Current Licensesin the menu bar. Your license can be renewed in one single step.

3. If you are using other licenses, or you encountered any problem in the previous step, you can reactivate your MATLAB. In the menu bar, selectHelp - Licensing - Activate Software.

4. ChooseActivate automatically using the Internet (recommended). ClickNext. Then login with your MathWorks account (Registeted with SJTU email). Choose the license "MATLAB (individual)", and click on "Next".

5.Restart your MATLAB.