Vacuum-packed features: 1 excluding the packaging container in local air (oxygen) can effectively prevent food spoilage transformation. Can effectively prevent the exchange of packaging material content; (2) the use of barrier (tightness) excellent packaging materials and sealing technology and strict requirements. To prevent food weight loss, loss of taste, but will also prevent secondary pollution. Accelerate the heat conduction; 3 vacuum-packed container internal gas has been ruled out. This can improve the thermal disinfection efficiency, but also to avoid the heat sterilization time, due to the expansion of gas leaving the containers burst.