In the technology of intersatellite laser communication, fine tracking system is very important for the establishment and maintenance of the entire optical communication link. In this paper, the transfer function of the controller object of the fine tracking system, the fast steering mirror is modeled, and the complete mathematical model is obtained based on the parameter optimize the control effect and improve the disturbance suppression ability. The control performance of the two is compared by Simulink, and the disturbance is added in the simulation to test the robustness of the controller. The simulation results show that the fuzzy self-tuning PID controller has significant disturbance suppression ability in the control process of fine tracking system.