When the aircraft is flying in high-altitude and high-speed flight，its infrared images are difficult to be acqaired.In order to solve this problem，the aircraft radiation is divided into two main parts，aircraft skin’s radiation and exhaust system’s radiation.Based on the classical radiation theory，and combined with the engineering model of heat transfer and jet dynamics，an efficient aircraft infrared simulation model is built up.In the calculation of aircraft skin’s radiation，the heat balance equations，which take into account aerodynamic heat convection，environmental heat radiation，internal heat radiation and the skin’s heat radiation，was established in order to acquire the aircraft skin’s temperature distribution.In the calculation of exhaust system’s radiation，the plume flow field calculation model，the figure envelope model and the non-uniform hot gas radiation model are combined.At last，infrared images are programmed by the VC++ platform and the Open Graphics Library.The simubined infrared images can offer target’s infrared radiation images for the simulation of the infrared radiation image guided weapons，which can be helpful to the evaluation of the infrared radiation image guided weapon systems.