The specific operation is as follows: ① Click "Settings";
② Select "More Settings" to enter the interface of more settings;
③ Click "Developer Options" to enter the interface for setting developer options;
④ Click "USB debugging" to open the USB debugging function.
Note: If you can't find the "developer option" in your mobile phone, you can search Baidu for "What if Xiaomi 5 miui8 system can't find the developer option?" Follow the steps to open the "Developer Options" function.