The flexible packaging of canned food shall be called high-barrier flexible packaging, that is, with aluminum foil, aluminum or alloy flakes, ethylene vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), oxide-coated (SiO or Al2O3) acrylic resin layer or Nano-inorganic substances are the barrier layer, and the volume of oxygen permeating per unit area within 24h is less than 1mL under the conditions of temperature of 20℃, air pressure of 0.1MPa and relative humidity of 85%. package of. Flexible packaged canned food should be called high-barrier flexible-packaged food, usually called soft canned food, which is to use high-barrier aluminum-plastic composite or plastic composite containers after processing raw materials such as livestock, poultry, aquatic products, fruits, vegetables, and grains that meet the requirements. Food that has been canned (filled), sealed, sterilized or aseptically filled to meet commercial sterility requirements. At present, there are more and more soft canned food in our country, especially the leisure canned food to meet the needs of consumers' travel and fast pace of life. At the same time, my country's flexible packaging processing technology has gradually matured, and the development of flexible packaging materials and containers has been accelerated mainly through the introduction of foreign technology. However, our country carried out less work in the risk assessment and standard formulation of flexible packaging products. At present, relevant evaluation standards and food safety standards are being established.