According to MR fluid properties and MR damper structure, a multi-body dynamic model of semi-active landing gear was built by using virtual prototype in ADMAS/Aircraft. Fuzzy control system for the semi-active landing gear with MR damper was designed under the MATLAB/Simulink environment. Co-Simulation of ADAMS/Aircraft and MATLAB/Simulink were carried out. The simulation results show that semi-active landing gear with MR damper based on fuzzy control strategy can reduce the aircraft’s vibration and improve the ride comfort characteristics. Co-simulation method provides one simple feasible method for the process of landing gear design, development and manufacture. It also offers a new way to advance designing quality for complex dynamic system and control strategy simulation.