1. Software Cache: The application used may leave the cached files on the mobile phone, thus occupying more memory. You can try cleaning up these cache files. Select the application you want to clean in the Application Manager, and then click Clean Cache.
2. Useless data: Your mobile phone may contain a lot of useless data, such as photos, videos and music. These data will also occupy the memory of the mobile phone. You can use the file manager to delete these useless data.
3. Virus or malware: If your Mate20 mobile phone is infected with virus or malware, there will be abnormal memory usage. You can use security software to detect and clean these malware.
4. Update the software version: If your Mate20 phone is running an old version of the operating system, there may be abnormal memory usage. Try upgrading the latest version of the operating system.