In order to meet the tracking accuracy requirements of the laser communication system, a fast steering mirror system is used as the core of fine tracking control, and a voice coil motor with large stroke, high resolution and high bandwidth is selected to drive the fast steering mirror, and the control method of voice coil motor is studied. Firstly, the composition and working principle of the fast steering mirror system is analyzed. Then, modeling analysis is performed according to the equivalent circuit model of the voice coil motor, and the transfer function model of the fast reflector is obtained. Finally, the design principle of the analog controller, the proportional-integral-derivative (PID) circuit, the position detection circuit and the power amplifier circuit are introduced. The experimental results show that the angular resolution of the fast steering mirror is 1μrad, the repeated positioning accuracy is 3μrad, and the closed-loop bandwidth (-3dB) is 300Hz@1mrad, which can meet the requirements of laser communication system for stability, reliability, high precision, and strong anti-interference ability.