A one-dimensional thermophysical model is used to investigate the simulation of the infrared thermal signature of mental plate with phase change material(PCM) plate theoretically. The optimized parameters are obtained by the theoretical calculations. Based on the calculation results, a kind of organic PCM is selected to experimentally verify the model, and the good match between the theoretical and experimental results is achieved. The results of this investigation provide the design rules and key materials for the application of PCMs in false target.