In the high temperature environment, human physiological functions, especially body temperature regulation, water and salt metabolism, blood circulation and other functions have changed abnormally. For example, sweating a lot will increase the burden on the cardiovascular system. If the high temperature exceeds the human body's tolerance, it will reduce work efficiency and affect judgment. In severe cases, it will cause heatstroke, and in more serious cases, it will lead to sudden death. In the high temperature environment without air conditioning or other refrigeration equipment, how to reduce the human body temperature through its own devices and fight against the troubles caused by heat is a topic that researchers all over the world are studying. According to the different needs of various industries, researchers from various countries have developed various ice vests.