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In this paper, a method of back stepping sliding mode controller based on non-linear disturbance observer is proposed for the flight simulator servo systems considering the uncertainty. In this method, back stepping control is used to design virtual control desired speed, then nonlinear disturbance observer is used to observe the uncertain disturbance of system, and then adaptive global sliding mode controller is designed for the system using nonlinear disturbance observer, which can achieve the robust tracking control of desired angle signal of flight simulator servo systems. Simulation results have shown that the method has a good performance on control effect and is valuable on engineering application.