The principle of air-conditioned packaging is that the air in the package is replaced by special gas. Different gas ratios can be used to package according to the types of food. Generally, N2, O2, CO2, etc., are used for air-conditioned packaging. Air conditioning packaging products pay attention to the concept of ready-to-eat fresh, so the food must be cold chain in the whole process of air conditioning packaging, so that the food can ensure the temperature of 0~4. The product is generally about 10~15 days, air conditioning packaging is mainly for fresh goods and ready-to-eat fresh goods.