In order to study the influence of attack angle on trajectory in the instance of oblique penetration, the process of projectile penetrating plumb and obliquely into concrete target was numerically simulated by the finite element code LS-DYNA. Rationality of finite model was validated by comparing the simulated results with calculated results of Young experiential formula in the instance of plumb penetration. Then the influences of incidence angle and attack angle on trajectory figure, penetration depth and blast effect were studied by changing the direction of penetration and velocity. The results indicate that the positive and minus attack angle make a great difference in trajectory figure of oblique penetration; the penetration depth and blast effect of positive attack angle is better than minus attack angle.