The development status of closed loop electro optic countermeasure technology was introduced.In order to obtain the forecast evaluation of photoelectric jamming effectivenessa forecast evaluation model was built up based on BP neural network by analyzing the technical principle and influence factors of laser jamming to optical seekerand some photoelectric jamming experiments were implemented.After the comparative analysis to forecast result and experiment resultthe accuracy of the prediction model was verified.The research can provide an application foundation for feasibility analysis of this method in photoelectric countermeasure.