The reverse Monte Carlo method was used in the computer program.And the ideal of program design and the way of realization were introduced particularly.Computer processes and formulas were provided.At a given flight condition

the infrared radiation characteristics of missile scarfskin were obtained by calculation.Brief comparison and analysis of the computing results were conducted.For subsonic missile

the radiation at 2～5 μm can be ignored relative to the radiation at 8～14 μm.For supersonic missile

the radiation at 2～5 μm is a half of the radiation at 8～14 μm.The radiation increases at the detected position of 0°～90° degree and decreases at the detected position of 90°～180° degree.The atmosphere attenuation effect on subsonic missile is strong at low altitude and is weak on supersonic missile at high altitude.The max radiation of supersonic missile scarfskin is 18 times as that of ultrasonic missile scarfskin.