In order to suppress the influence of disturbance signal on fast steering mirror system and ensure the ability of suppressing disturbance signal when the structural characteristics of the fast steering mirror have changed,a compound control system which can fuzzily compensate the disturbance signal is proposed.To compensate the deviation caused by disturbance,the output parameters of fuzzy controller are used to set the control parameters of the PID controller and the feed forward link at the same time.The control system don’t need extra sensors,which will not increase the complexity of hardware system.By using frequency domain analysis method,the initial control parameters of PID controller are designed,and then the rules of fuzzy control are designed.Finally,the simulation experiments are carried out.Experiment results show:whether the structural parameters of the fast steering mirror change or not,the disturbance fuzzy compensation control system both has a good ability to suppress disturbance signal.