Threats posed by explosions due to terrorism or industrial accidents should be considered in the structural design of infrastructure and other valuable facilities. In the current study, effects of polyurea reinforcement on concrete plates under contact explosion were investigated experimentally. Concrete plate specimens had a thickness ranging 50 mm and 80mm coated by 2, 4 and 6mm polyurea. Damage of these specimens under contact explosion caused by between 15g and 175g of composition C-4 explosive were observed. As the results, polyurea coating can effectively prevent from fragment caused by spalling. The damage dimensions of specimens depend on specimen conditions such as thickness of polyurea coating. Critical values of rupture of specimens as function of concrete thickness, polyurea thickness and charge mass were provided.