As the key high-temperature component of aerospace vehicles, aero-engine contributes to the infrared radiation intensity of the entire aircraft, of which the mid-wavelength band of 3~5 μm and the long-wavelength band of 8~14 μm are the main radiation wave bands. Considering the significance of the infrared radiation intensity measurement and analysis, and based on the requirements of GJB-241 for infrared radiation characteristic test and identification, the establishment of a set of infrared radiation characteristics test methods taking into account the environment, meteorology, test equipment and other factors that can be applied to aero-engine racks and an engine test. The test results show that the proposed test method can meet the infrared radiation test requirements of this engine, obtain the typical infrared spectrum curves of the engine at different wavelengths, accumulate the relevant test experience of the model, and lay a certain foundation for the subsequent research.