Abstract: In order to overcome the backlash nonlinearity, parameters variability and unknown disturbance for high response missile borne electric rudder servo, a backsteeping and power fast terminal siding mode (PFTSM) control algorithm was proposed. A continuously differentiable function zone model was designed to approximate backlash nonlinear. The state space model was formulated for the controller design as three subsystems. The power fast terminal siding mode controller was designed by using backstepping approaches. Direct torque control was applied to improve dynamic response for inner loop. Based on the Lyapunov stability analysis, it is shown that the proposed control strategy guarantees that asymptotic force tracking is achieved, all closed loop signals are ensured to be bounded. Experimental results show the effectiveness of the proposed method. Compared the PID and backtepping control, the precision, convergence speed and robustness are improved significantly for high response missile borne electric servo system.