In order to study the infrared target characteristics of "low slow small" aircraft, the infrared target characteristics of six rotors unmanned aerial vehicle (UAV) are studied by numerical calculation. Considering the aerodynamic heating effect of rotor, and the radiation effect of the sun and the earth's atmosphere on the target, the changes of the target's radiation intensity in the three infrared bands of 1 ~ 3 μ m, 3 ~ 5 μ m, 8 ~ 12 μ m at night and in the daytime are studied under different observation angles. The results show that in the medium / long wave band, the target's infrared radiation mainly comes from the reflection of its own radiation and the earth's atmosphere, so its radiation characteristics change little in the daytime and at night, while for the short wave, the target's radiation intensity in the daytime is greater than that in the evening; the target's radiation intensity is directly related to the observation area, and the radiation intensity is the smallest in the positive and lateral observation, while the radiation intensity in the upward and The radiation intensity is the highest when looking down.
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