Aiming at the problem that the characteristics of fast steering mirror and the external environment change constantly during the working process, a control strategy combining the fuzzy control theory and the traditional proportional-integral-derivative (PID) control, namely fuzzy PID control, is proposed. According to the mechanical structure and motion characteristics of the fast steering mirror, the dynamic model of the fast steering mirror is established and the fuzzy PID controller of the fast steering mirror is designed. The simulation model is built in Matlab/Simulink and the simulation results of angle control between traditional PID control and fuzzy PID control are analyzed and compared. The experimental results show that the fuzzy PID controller realizes the stable control of the fast steering mirror, and the time for the fast steering mirror to reach stability is 0.13 s, and the overshoot phenomenon is effectively eliminated.