Abstract: It is very important to research the structural dynamic response of torpedo under the shock of underwater explosion and the damage radius of anti-torpedo torpedo (ATT) for the development of ATT. Based on the finite element analysis software MSC. Dytran, models of the torpedo attacked by ATT, ATT explosive, and water area were presented, and simulations were conducted. Therefore, the courses of shock wave propagation and dynamic response on topedo due to blast of ATT′s explosive were achieved, and the effects of different explosion distances and different water pressures on torpedo were also analyzed. According to the current ship damage standards in the world and the simulation results, damage radii evaluations and different types of damage rules of the torpedo attacked by ATT were obtained.