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For electromechanical (EMA) flight surface actuation systems, the controller of which use proportional control with a velocity feedback, this manuscript sets up a more complete simulation model considering the presence of the backlash and the friction to analyze the effects of both nonlinear factors. Based on the characteristics of the driving chain, a strategy for the research of the nonlinear factors is proposed, according to which LuGre friction and dead zone model are applied into the second-order EMA system. Our results indicate that free play in driving mechanisms and friction can lead to the tracking error and affect the stability of the EMA system.