The perforation damage model and the fragment velocity of the metal plane under local contact explosion were studied. The basic features of the damage model were obtained by the experiment. Based on the experiment result, the numerical simulation was carried out to analyze the essential features of the damage process and the fragment velocity. The formula of the velocity of the perforation fragment was deduced based on the Gurney velocity theory and the failure work theory. The results of the perforation experiment and the numerical simulation verify the shear theory is suitable to explain the perforation of metal plane under contact explosion.