In order to define the different rib reinforcement plates under explosion load change and response characteristics of antiknock performance, the response of eight reinforced metal plates under different explosive loads is numerically simulated by using the nonlinear dynamic finite element software AUTODYN. The development law of the residual deflection at the center point of steel plates under the action of explosive loads and the relationship between the total energy and the plastic deformation energy are analyzed. The results show that:1) The deflection of the metal plate is approximately linear with the proportional distance before the obvious failure or break occurs.2) Under the same load, with the change of the stiffener mode, the residual deflection of the center point of the metal plate presents a "stepped" change.3) When the rib reinforcement do not pass through the projection point of the explosive center on the metal plate, the residual deflection of the center point of the metal plate is larger under the explosion load.4) With the increasing number of rib reinforcements, the proportion of plastic deformation energy in total energy decreases gradually, and the overall anti explosion performance of metal plate increases. The results of the study are of reference value to the explosion-resistant design of metal plates.