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During the aircraft’s flight, steering gear may sustain aerodynamic torque loader. Motor drive load simulator is the ground hardware-in-the–loop equipment which is used for simulating aerodynamic torque loader’s change rule. For the ground test procedure, the problem of surplus torque arises because the mechanical structure’s coupling between the traditional load simulator and the bearing system. Based on the magnetic particle clutch and torque sensor, we can structure virtual load simulator,by using the characteristic of torque’s size and direction only related to speed slip’s direction. We can settle the surplus torque finally. It improves torque loading test equipment’s performance, and results in a more highly level of aircraft’s virtual test.