Abstract: This paper discusses the constitution and principle of temperature distortion generator.Based on the inlet temperature distortion experiments of a turbofan-engine,the critical thermal agitation values under each engine operating condition were ascertained,the distortion sensitivity coefficients of the engine were determined,and a practical technical aero-engine stability assessment method for inlet temperature distortion was presented.It is proved that the temperature distortion generator is a useful tool for aero-engine stability assessment.The successful development of a temperature distortion generator will have significant effects on the formulating of our country's assessment criterion of aero-engine inlet temperature distortion.