Bullet-proof glass is a kind of transparent window material utilized for load-bearing and various specialized functions in both military and civil field. Based on the previous studies, a new composite structure composed of inorganic glass, PMMA and PC materials with different combinations was proposed with the aim of improved impact resistance and lightened material weight. Using ABAQUS software, the mechanical properties of the designed bullet-proof glass during impact process were investigated by numerical simulation. The results showed that for the same thickness, the more the layers were, the more concentrated the stress distribution was, and that the impact resistance of the material was proportional to the thickness. Under optimized configuration, the 14mm thick bullet-proof glass was able to withstand the frontal impact of a 7.62 mm warhead at a speed of 600 m/s.