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In order to solve the detection problem of vehicle exhaust plume infrared radiation,the effect of the vehicle moving state to plume infrared radiation characteristics is analyzed.To describe the infrared radiation characteristics for non-uniform hot gas·The nonuniform gas components are divided into 20000 small air columns by C-G approximation method of the spectral band model.The calculation method of the spectral distribution characteristics at 3~5 wavebands and 8~14 wavebands and spatial distribution characteristics of infrared radiation for non-uniform hot gas is deduced.