1. Food cold chain refers to a special supply chain system in which perishable food is always in the necessary low-temperature environment during the processing, storage, transportation, distribution and retail of products until it reaches consumers, so as to ensure food quality and safety, reduce loss and prevent pollution.

2. Food cold chain is established with the progress of science and technology and the development of refrigeration technology. It is a low-temperature logistics phenomenon based on refrigeration technology. Therefore, the construction of cold chain requires comprehensive consideration of various problems involved in production, transportation, sales, economy, technology, etc., and coordination between them to ensure the safety of perishable food in the process of processing, transportation and sales. It is a high-tech cryogenic system engineering.