Abstract: Aiming at the high-performance requirements of electric pitch system of megawatt wind turbine for the position tracking and load disturbance regulation characteristics, a two-degree-of-freedom internal model control(2DOF-IMC)is proposed for electric pitch Servo control system, in which a permanent magnetism synchronous motor(PMSM)is used.Based on the analysis of the operating principle of electric pitch and the control strategy of the servo-control system, a two-degree-of-freedom internal model controller is designed, which implements electric pitch system double optimal control of position tracking and anti-disturbance, also effectively suppresses the torque ripple.The simulation results prove that the control strategy is more effective than conventional PID control.