Abstract: Based on the nonlinear finite element software LS-DYNA, the deformation of polyurea steel plate composite structure under explosive loading was simulated by using CONWEP algorithm. The simulated results were compared with the experimental results. The results show that the CONWEP algorithm can well simulate the deformation of polyurea steel plate composite structure under explosive loading. With the same steel plate thickness, the maximum deformation deflection of polyurea steel plate composite structure is smaller than that of bare steel plate. From the results of energy-absorbing, polyurea elastomer has good energy-absorbing characteristics, and the energy-absorbing of steel plate in composite structure is lower than bare steel plate, which makes the deformation of steel plate in composite structure is also lower than that of bare steel plate.