Abstract: Based on the simulation model of the space location relationship between electromagnetic pulse (EMP) bomb and phased-array radar antenna, the coverage ratio of the antenna and other parameters were discussed. The influence of trajectory deviation on the coverage area of the antenna was analyzed, and simulation was also carried out. The simulation results show that some relevant parameters including initiating height and fall point accuracy can influence the coverage area to the phased-array radar antenna. In order to reach the best damage to the target, the accuracy of initiating height, trajectory tilt angle, roll angle and other parameters, and the power density of the target should be considered synthetically.