In order to achieve the position limit function of the wave surface analyzer wireless adjustment unit, the system uses a position limit control system to limit position travel of the motor. The system also can obtain the voltage information of trigger and the limit state voltage information of precision DC motor through the CC2530 control panel. The experimental results show that the position limit system of the wireless adjustment unit of the wave surface analyzer can realize the position limit control of the adjustment unit which makes the adjustment of the wireless adjustment unit of the wave surface analyzer more accurate and effective and is beneficial to the accurate measurement of the sample surface.