Abstract: Using auto-disturbances-rejection controller(ADRC),a new scheme is proposed to design controller for aircraft pitch movement in big flight envelope.The new scheme realizes the tracking control of flight pitch angle by applying second order ADRC to compensate model disturbances and uncertainty.Based on the nonlinear model of aircraft,ADRC is specially suitable for aircraft dynamic model that exists big disturbances.Furthermore,without changing the structure and parameters of controller in big flight envelope,this scheme can simplify the design of flight control system.The simulation results in big flight envelope show that the system achieves high dynamic performance,steady state performance and robust performance.The design using ADRC brings a new effective method to solve the problem of flight control in big flight envelope.