Ice temperature preservation is a new storage technology, which overcomes the defects of freezing above 0 ℃ and freezing below - 18 ℃, and can ensure the flavor, taste and freshness of food. Ice temperature refers to the temperature range from 0 ℃ to the freezing temperature of organisms, which is called ice temperature zone, or ice temperature for short. Different foods have different ice temperature zones. Generally, the ice temperature zone of fruits and vegetables is between 0 ℃ and - 2.5 ℃, and that of a few foods is about 0.5 ℃. Ice temperature preservation technology is to control the temperature of food in the range of ice temperature zone by using the cooling method, so as to achieve a "dormancy" state. The metabolism of food tissue cells is the smallest and the energy consumption is the smallest, so it can effectively store food. The time and freshness of the frozen food are more than twice that of the ordinary food. As the "ice temperate zone" of food is relatively narrow, subtle temperature fluctuations in the storage environment may bring about changes in food quality. If the storage temperature is lower than the freezing point of fruits and vegetables, the fruits and vegetables will suffer from freezing damage, resulting in a lot of economic losses. Therefore, the storage environment temperature and other factors of ice temperature fresh-keeping storehouse must be accurately controlled, which is more strict than the technical requirements of ordinary cold storage environment. Ice temperature preservation and storage environment is a comprehensive application of various technologies, including refrigeration, heat transfer, aerodynamics, building structure, precise control, precise detection, data communication, module programming, power regulation, etc., which integrates control, monitoring, constant temperature and humidity, so as to minimize the metabolism, respiration and material consumption of stored food.