Atmospheric transmittance of infrared radiation has a significant influence on the measurement accuracy of target radiation.The attenuation of infrared radiation in the atmosphere transmission was analyzed,and the calculation model of atmospheric transmittance of infrared radiation was established.The change of atmospheric transmittance for a given radiation path in one day was studied by using calculation program to calculate atmospheric transmittance of infrared radiation;atmospheric transmittances under the different meteorological conditions or radiation paths were calculated to study the influence of temperature,relative humidity,path starting height,radiation distance,zenith on atmospheric transmittance,and the results were analyzed.The results have certain guiding significance for the accurate calculation of atmospheric transmittance,and the research on the influence of meteorological conditions,geometric parameters of the path on atmospheric transmittance.