In order to provide a reference for design of projectiles, the process of a small caliber artillery armor-piercing high-explosive projectile penetrating homogeneous steel plate was simulated by ANSYS/LS-DYNA. The effect of the projectile angle of attack, velocity and thickness of armor target on safety of charge was obtained. The results indicate that the safety of charge becomes worse with increased impact velocity. The safety of charge becomes better at first and then worse with increased impact angle. The safety of charges is worse when 70 angle or 80 angle than 0 angle. The safety of charge is threated for large impact angle. The projectile charge is not safe when target plate increases to a certain thickness.