Considering that the simulating calculation of aircraft infrared characteristics has poor adaptability to the conditions,we used simple and reliable modeling method,classified the infrared radiation by the radiation sources,and established the infrared radiation model of each part.Based on the model,the simulating calculation program of aircraft infrared characteristics under different conditions was designed by using CVI.The aircraft infrared characteristics under different conditions were analyzed by using the calculating example,and the extreme values of radiation intensity were obtained.Compared with the data given in other references,our simulating method has higher feasibility and precision,which can provide a theoretical basis for infrared target simulation in hardware.