Remote sensing technology is a space observation technology, aerospace optical remote sensor is playing a huge role in the national security, weather forecasting, disaster monitoring and so on. Inflight flight, in order to complete the task with higher quality, we inevitably will adjust the moving parts. Stepper motor has a high openloop control accuracy, simple control, stable output torque. In order to meet the accuracy of high precision and stability of the torque, the experiment proposed fourphase eightstep control scheme, using FPGA as a stepper motor controller. Design chopping adjustment program to adjust the voltage and hardware current closedloop scheme to adjust the current, board hardware circuit, and finally through the software to achieve parameter measurement. The system improves the precision of the stepping motor control and improves the stability of the torque, and puts forward a new scheme for the control of moving parts of the remote sensor.