Based on hopkinson bar (SHPB) experiments, for some aviation organic glass materials and fragile projectile composite materials by the mixture of metal and sulfur, getting two materials dynamic mechanics parameters under different strain rate. According to the experimental data fitting, getting the Johnson - cook intensity model materi-als parameters of fragile projectile and aviation organic glass, And verifying the parameters with the use of numerical simulation. On this basis, on the use of AUTODYN - 3d finite element program, the whole process of the fragile projec-tile with different warhead forms impacting aviation organic glass is numerically simulated. Through comparing crush-ing effect of the projectile and the damage effect of aviation organic glass, analyzing and summarizing some laws. The results show that: the composite material has good effect of fragile; the crushing effect of empty pointed fragile projectile is better than that of ordinary fragile projectile, and the damage effect of aviation organic glass by the former is less than that by the latter, the empty pointed fragile projectile is more in line with the actual application than the other.