Abstract: For mastering the dynamic infrared radiation characteristics on the surface of terminal-sensitive projectile when it was projected from cabin of the carrier shell, according to the structure characteristics, combining with the dynamic model of the deceleration and despinning stage, the physical model of temperature field and radiation characteristics were established under the comprehensive effect of aerodynamic heating, internal heat source and the heat exchange with environment. Based on the coupled solution of thermal balance equations and trajectory model, the distribution law of surface temperature field and radiance were obtained. Finally, the infrared radiation intensity of different spectral bands varying with flying time were calculated and analyzed in different initial conditions. The results provide valuable reference for the infrared detection and recognition of terminal-sensitive projectile.