Due to the high strength and excellent durability,concrete has been wildly used in many fundamental constructions.The concrete structure would bear not only the static and earthquake loading but also the anti-penetration and blasting effects in the war and terrorist attack.Penetration process is a problem of transient contact that projectile interact with target.Nowadays,many studies have been conducted by means of the theoretical,simulation and experiment analysis [1-5].In the present study,the random model of three-phase heterogeneous composite was used in the modeling of concrete,which consists of aggregate,cement hydrates and the Interfacial Transition Zone(ITZ)around aggregates [6].Both the uniform model and mesoscopic model of concrete was used in the numerical simulation to analyze the normal penetration mechanism of rigid projectile(Fig.1).And the ballistic trajectory deflexion was studies by the mesoscopic composition analysis.