The study of reduction of trajectory deflexion was conducted in this paper. Based on dynamic mechanics analysis of projectile and concrete target during impact, a cone-shaped projectile was designed to block trajectory deflexion of projectile by parietal moment generated in penetration. The penetration experiments of the cone-shaped and the traditional penetrators into concrete target were carried out with 130 mm light gas gun. The results show that trajectory deflexion of cone-shaped penetrators are smaller than that of traditional ones. The cone-shaped penetrator is suitable for oblique penetration and penetration into thick targets at high speed.