1, open the control panel-mouse;

2. Set the pulley and slide the lower rows at a time, and change it to 1.

If the problem still exists, it is a hardware problem and a mouse encoder problem. If it's a mouse with tens of dollars, it doesn't need to be repaired. If the value of the mouse is high, you can follow the following methods (which require some hands-on ability):

1. first disassemble the mouse and check the size and interface of the mouse encoder (Baidu can also do it, and the more expensive mouse has parameters online);

2. Buy a new mouse editor that is compatible with the original size and interface;

3. Remove the original one, replace it with a new one, and weld it with solder.