In the development of fast food of catering trade, the cold chain of assorted food, such as low-temperature processing and cold chain circulation,is the only way. The construction of complete and eligible cold chain is the guarantee for sanitation, greenness and taste of food and pre-produced foods. In comparison with delivery method of hot chain preservation over 70?C, cold chain has some advantages including lowcosts and convenient operation. In the development of fast food of catering trade, the cold chain of assorted food, such as low-temperature processing and cold chain circulation, is the only way. The construction of complete and eligible cold chain is the guarantee for sanitation, greenness and taste In addition, the method of hot chain preservation over 70? C, cold chain has some advantages including lowcosts and convenient operation.