Ballistic performance and failure mechanism of the high-strength low-cost Ti5322 alloy with thickness of 45 mm impacted by the 105 mm rod-like armor piercing simulating projectile were investigated,and the effect of impact angle on ballistic performance was also discussed. The results show that,the mass efficiency Emis about to be 1.80,and the space efficiency Esis about to be 1. 02. Analysis of the macro-and micro-damage features of the perforated Ti5322 alloy conduced find that,the behavior of adiabatic shear bands plays a key role in failure mechanism. As was observed,the eroding between the 105 mm rod-like armor piercing simulating projectile and the Ti5322 alloy facilitate the deformation and fragmentation of the target on the one hand,and on the other hand,effectively absorbe and consume the mass and the energy of the rod-like projectile.