Abstract: The numerical simulation result for the penetration of ceramic composite plate by long-rod projectile of tungsten alloy was presented. The front and back of the composite plate is made of armor steel and in the middle is ceramic. The Johnson-Cook constitutive equation was adopted to describe the deformations of the armor steel and the projectile. The Mohr-Coulomb cap model was combined with the Bodner-Partom constitutive equations to describe the comminuted strength and the flow stress of the ceramic. The iterative method using consistent mass matrix was used to improve the computation accuracy and the interface eroding technique was introduced to deal with the failure of the meshes. The computational results of the penetration depth are in agreement with the experiments.