In order to satisfy the need of the remotely operated weapon station precision servo control, this paper designs a motion controller using digital signals processor (DSP) TMS320F2812 as the core. The controller samples the sensor value by the hi-speed I/O in the DSP. The DSP sends orders to the motor. It realizes the position control and improves the accuracy of the control system. The controller is used in a certain type remotely operated weapon station. The practice shows that the motion controller is stable and reliable. It can be widely apply in the system of remotely operated weapon station.