Abstract: The situation of leaf vegetables preservation was introduced in this paper. Advantages of modified atmosphere packaging (MAP) on leaf vegetables were summed up for its low energy consumption, easy and safe operation, with a review of MAP application at home and abroad. The lack of preservation technology system for leaf vegetables and better- targeted- preservation packaging materials were pointed out. Preservation mechanism based on fre radical center effect of MAP on leaf vegetables was put forward, with the summary of the application of free radical theory of modified atmosphere packaging to fruit and root vegetables, and fruits vegetables. Future applications of transcription and proteomics in preservation mechanism study were discussed in the last.