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In order to reduce the aircraft wheel shimmy,enhance the comfort and safety of the aircraft,apply the magnetorheological (MR) control theory into shimmy damper of aircraft landing gear,achieve the real time and intelligent control.According to magnetorheological (MR) shimmy damper, the semi-active control of a nonlinear dynamic model of the landing gear was established.FuzzyPID control algorithm was set up. And the model of semi-active control was created by using Matlab/Simulink.It adjusted the damping force of magnetorheological(MR) shimmy damper by controlling the current which flows through the magnetic coil. Therefore, it can reduce the swing of the wheels. The semi-active control for magnetorheological(MR) shimmy damper was realized. By using dynamic simulation, comparing non-magnetorheological(MR) shimmy damper, passive control and semi-active control, we get the time curves of oscillation angle, the lateral displacement and the angle of the side slip. The simulation results show that FuzzyPID control algorithm was correct and feasible,the algorithm can good restrain the shimmy of airplane wheel,The results also show that FuzzyPID control algorithm has good controllability, the effect of diminishing oscillation is also better than the traditional passive control.