In the application environment of more electric aircraft, simple PID control cannot achieve the ideal control requirements because of the strong nonlinearity of ElectroHydrostatic Actuator (EHA) system and uncertainty of external variable load. This paper provides a sliding modePID control system, in which the motor current loop and speed loop form the inner loop of the control system, and PI controller is used to control motor speed; the actuator cylinder position loop is the outer loop, sliding mode control is used to improve rapidity and robustness. EHA mathematical model is established, and sliding mode controller structure is designed. The simulation results show that the sliding modePID control can eliminate the overshoot, reduce the tracking error and achieve the precise control of EHA position.