With the improvement of people's living standards, the use of air conditioning is increasingly widespread, building energy consumption is also increasing, energy issues are becoming increasingly prominent. At the same time, the use of mechanical compression refrigeration system brings about energy consumption and environmental pollution, which also challenges the sustainable development of human beings.And also,the energy-saving of refrigeration equipment has great practical significance and far-reaching historical significance.This paper describes the current status of jet refrigeration cycle at home and abroad, and the calculation and results of jet subcooling. By analyzing the thermodynamic performance of jet subcooling cycle, it is hoped that improving the performance parameters of refrigeration system in China will play a certain role in saving energy