A mouse with an adjustable resolution function executes the cursor control function normally. The mouse includes an adjustment unit, a processor, and a sensor unit. The adjustment unit optionally generates an adjusting signal and transmits the adjusting signal to the processor. The processor receives the adjusting signal, generates a control signal correspondingly and transmits the control signal to the sensor unit. According to the control signal and the moving path of the mouse, the sensor unit correspondingly generates a displacement signal to the processor and enables the mouse to execute the cursor moving function in accordance with the displacement signal.