In order to reduce penetration overload and increase penetration depth during the process of penetration, a structure with stress concentration characteristics was added on the nose of oval penetrator; A numerical simulation was conducted for simulating the process of penetrating steel target by using a finite element software ANSYS / LS-DYNA, then residual velocity and penetration overload were obtained and compared with tapered and oval warheads; The results showed that compared with conventional warhead, warhead with stress concentration characteristics can improve the depth of penetration and better reduce overload, so that provide a safeguard for the stability of something inside the penetrator, such as dynamite and so on. The feasibility of using stress concentration for penetrating was validated.