In view of the nonlinearity of the dual-axis,dual-frame photoelectric platform motor and the influence of the coupling caused by the interaction between azimuth and pitch shafting on the control accuracy,an inverse system based nonlinear decoupling control method is proposed for photoelectric stabilized platform.Firstly,according to the dynamic models of azimuth and pitch frames of the dual-axis photoelectric stabilized platform,the state space equation is established,and then an inverse system is designed to obtain the state variables of the system.The inverse system is connected in series with the original system to obtain a pseudo linear system,which transforms the original single coupled nonlinear multi-input multi-output system into two linear decoupled single-input single-output subsystems,so as to eliminate the strong nonlinear coupling between the azimuth and pitch shafting.Finally,the system simulation platform is established in Matlab.The simulation results show that the nonlinear decoupling method of photoelectric platform based on inverse system can effectively reduce the coupling between azimuth and pitch axis system,and improve the stability accuracy of the platform system.