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The control system of three-axis flight simulator was required to have excellent dynamic tracing performance as well as fine noise-restrained property because the coupling in the frames of the flight simulator and the indeterminate time-invariant disturber in the hydraulic pressure system exists. Based on the characteristic of three-axis flight simulator, two-degree-of-freedom PID controller for outer-frame of flight simulator was designed. This type of controller had the capability of tracing target value as well as restraining noise. In addition, the outer-frame controller parameters were set based on improved genetic algorithm. Simulation results show the effectiveness of the controller. At the same time, the controller, which was designed based on the nominal model, is used on the other model. Simulation results show that the controller has the property of robustness.