Aiming at the reduction of LOS stability accuracy of the airborne optoelectronic stabilization platform due to the disturbance,based on the disturbance estimation analysis and bandwidth limitation analysis of the LESO,the fast power reaching is modified,and then a fast power reaching law sliding mode active disturbance rejection controller is proposed.The system stability analysis based on Lyapunov method is carried out.The simulation results show that,under the disturbance and parameter perturbation,compared with the traditional sliding mode controller and PID,the system designed with the new controller has higher stability accuracy and remarkable chattering suppression effect.Compared with the controller when the reaching law is not modified,the new controller can maintain the high-precision output of the system.Furthermore,the design of the new controller hardly depends on the system model information.Therefore,the proposed method can improve the performance of the control system of airborne optoelectronic stabilization platform.