Aiming at the requirement of infrared countermeasure and aerial combat simulation,the IR imaging method of the aircraft is studied. Based on the imaging mechanism of infrared detector,the IR imaging simulation model of the aircraft was established. Firstly,the computational domain geometry models of aircraft skin and exhausted plume were established separately,and the temperature distributions of aircraft skin and exhaust plume were calculated by Fluent,and it was taken into account the the influence of external heat transfer and internal heat conduction on the temperature field of aircraft skin. Secondly,the radiation brightness received by each pixel of the detector was calculated,and the radiation brightness was translated into grey levels. Finally,infrared images were programmed by the VC++ and the Open Graphics Library. The difference of infrared images and radiation intensity in different wave bands and different directions were compared and analyzed. The research result offers simulation model for the study of aircraft’s infrared radiation characteristics and target’s infrared radiation images for the research of infrared radiation imaging guided weapons.