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Usually the missile attitude control process in a large flight envelope has strong time-varying and nonlinear characteristics,so the controller parameter is difficultly scheduled with conventional PID control approach.In this study a linear active disturbance rejection control approach based on reduced-order linear extended state observer is proposed.The approach is employed to the attitude controller for a supersonic missile in attack with high angle.It is not hard to determine the proposed controller parameter,and the numeral simulations show that the presented approach has a very good capability on tracking attitude command.