The extensive application of military laser system in modern battlefield poses a serious threat to fighters and equipment.The military powers are placing increasing emphasis on the research and application of laser countermeasure technology.With the continuous change and deepening of the requirements of the army,there is an urgent need to explore new and more realistic methods of the application of laser decoupling interference equipment.In this paper,through theoretical analysis,the blind zone of photoelectric protection is analyzed and verified by experiments.The simulation analysis of typical laser weapon decoupling ballistics of foreign military is carried out through MATLAB,and the feasibility of cascade interference method is explored,which provides ideas for the perfection of the application of warfare methods.