Modified Atmosphere Packaging, which is a new type of device used for keeping fresh technology for food, which adopts protection mixed gas(usually is CO2, N2, O2) to replace the air of the inner package, taking advantage of every kind of protection gas makes different functions, for restrain the major microorganism breed that cause the food go bad, and make live food(fruits and vegetables etc. plant food) breath speed lowered, thus make food keep fresh and prolong the period of freshness. The food adopts Modified Atmosphere Packaging that can be better keep the orginal color, taste, appearance and nutrition ingredient.