Abstract: An analytical model is established to describe the complex behavior of ceramic/metal armor under the impact of a deformable projectile, which takes three aspects into account: the mushroom deformation of the projectile, the fragments of the ceramic tile, and the formation and change of ceramic conoid and the deformation of metal backup plate. Numerical simulation on the dynamic response of a ceramic/metal armor impacted by a deformable projectile was carried out with LS-DYNA3D. The simulated penetration processes are presented. The displacements at some representative positions are shown. Agreement observed among the analytical prediction, the numerical simulation and the experimental results confirms the validity of the analytical model and numerical simulation, suggesting the investigation developed provides a foundation for ceramic/metal armor design.