Abstract: The surface-type infrared decoy is an effective interference equipment to jam infrared imaging guided missile. It can jam the approaching infrared imaging guided missile by simulating the infrared signatures of the fighter to be protected. Firstly, the mechanism of surface-type infrared decoy for jamming infrared imaging guided missile was analyzed. Secondly, the radiation and moving models of surface-type infrared decoy were built. Then, the change rules of the surface-type infrared decoy's position, area and gray-scale were analyzed. The infrared images of the surface-type infrared decoy were generated. Finally, regarding the jamming success probability as the jamming effect evaluation criterion of surface-type infrared decoy, the jamming success probability in different distances and different quantities were calculated, and the simulation results were analyzed. The simulation results show that the surface-type infrared decoy can realistically simulate the spectral radiation distribution characteristic of fighter, which can effectively jam the infrared imaging guided missile and greatly improve the battlefield survivability of fighter.