In order to offer the best delay detonator time of damage unit accurately, and improve the efficiency of aerial target inter-ception in super short-range air defense weapon system the principle and characteristics of the linear shaped charge which was a-dopted as damage unit were investigated, and the movement model of linear shaped charge and the target was built. The best delay detonator time of the damage unit was obtained based on calculation and analysis; the result had guiding sense for calculating the time of short-range antimissile. We can also draw a conclusion that the linear shaped charge can intercept target more efficient by regulating the shooting angle in the best delay detonator time.