Abstract: Through the physical process analysis of the interaction of long rod with moving plate, based on the theoretical model of the long rod penetration into a semi-infinite target, the theoretical model of the long rod penetration into a moving plate target is established. This model can give a quantitative description of the disturbance of the moving plate by the diameter loss of the long rod. The results of the theoretical model are both verified by experiments and numerical simulations, and the model can used to study the long rod interaction with moving plates.