In order to reasonably design the size and weight of the torpedo countermeasure weapon and improve the operational efficiency, the numerical value of the damage characteristics of a spherical torpedo structure was studied. The LS-DYNA software was used to carry out the simulation of underwater static explosion, and the three-dimensional model was used to solve the model. The operating distance between the bare grain and a spherical torpedo, and the influence of the bare grain charge on the damage characteristics of the torpedo shell were analyzed. The results show that when the distance between the outer surface of the bare grain and the outer edge of the torpedo shell increases from 210 mm to 400 mm, the shell deformation decreases from 3.9% to 2.2%, and when the charge of the bare grain increases from 0. 5 kg to 2. 5 kg, the shell deformation decreases from 0.58% to 3.4%; The plastic deformation of the shell structure of the torpedo can be increased by increasing the charge amount of the bare charge column; the critical charge amount causing damage to the shell of the torpedo is detertorpedod to be 3 kg, and the critical distance is 20 mm.