Abstract: The modified dynamic damage model for modeling penetration into concrete or reinforced concrete was implemented into the three-dimensional transient dynamic explicit finite element code LS-DYNA with the user-defined material function. The model includes two parts: tension part described by TCK model indicating the strain rate sensitivity to tension process and the compression part described by HJC model. This model considers tension damage, compressive damage, strain softening, hydrostatic pressure and strain rate effects. By using the propsoed method, simulation on yawed penetration was carried out and compared with the experimental results. In simulation of penetration process the deformation and the velocity variation of the projectile and damage of the target were analyzed. Calculated results show that the model can predict the process of the yawed penetration into concrete well with the test data.