The impact of atmospheric and ground infrared radiation reflected by skin on the infrared stealth effect of low emissivity material of high-flying aircraft was computed and analyzed. The recovery temperature was applied to calculate the skin temperature

and the infrared radiation was computed by the reverse Monte Carlo method. Both summer and winter

the two typical climate conditions were considered in the computation. And both subsonic and supersonic cruise

the two typical flight conditions were also considered in the computation. Results show that

the reduction efficiency of low emissivity material on the aircraft infrared radiation is reduced 1.5%-6%;the detection distance of the detector is increased by 20%-70% considering the reflected infrared radiation of background infrared radiation; the infrared radiation of low-speed aircraft is more susceptible to the background infrared radiation

and the effect of summer is more obvious than winter; if reducing the emissivity of the upper surface of a low-speed aircraft

the total surface of a high-speed aircraft can get a better infrared stealth effect.