The deformation of the bullet non-penetrating the bulletproof helmet can cause a contact between the inside of the helmet and the head. This contact can cause injury to head. In order to study the non-penetrating phenomenon, the material of the bulletproof helmet is regarded as Johnson-Cook material model of ideal plasticity. The helmet surface curve is accurately drew by reference the national standard GA293-2012 "bulletproof police helmet and mask". The bullet is set to a rigid, bullet use 54 type pistol 7.62 mm bullet, with the speed of 450 m/s shooting bulletproof helmet. The simulation analysis is based on ABAQUS/Explicit, using ABAQUS display nonlinear dynamic analysis, helmets and bullet on the application of Abaqus adaptive grid technique. The results show that shooting point further away from the top of a helmet, the more damage to head may be cause..