With air filled in the box as a control group, three groups of different atmosphere-packaging atmosphere ratio, pre-treated four mixed fresh cut fruits and vegetables of carambola, Dangshan pear, cucumber, wheatgrass, stored at 4 ℃, Determine and analyze the quality of mixed fresh-cut fruits and vegetables by measuring and analyzing its physical and chemical indicators. The results showed that the mixed fresh-cut fruits and vegetables treated with 5% O₂+5% CO₂+90% N₂ had higher sensory quality after 8 days of storage, lower weight loss rate, good color and hardness, and lower soluble solids content. Growth is inhibited. It shows that the modified atmosphere packaging has good fresh-keeping effect on 4 kinds of fresh-cut fruits and vegetables mixed with carambola, Dangshan pear, cucumber and wheatgrass, among which the freshness-preserving effect is the best under the atmosphere ratio of 5% O₂+5% CO₂+90% N₂ With air filled in the box as a control group, the fresh-cut fruits and vegetables including carambola, Dangshan pear, cucumber and wheat grass were packaged and stored at 4 ℃. The quality of fresh-cut fruits and vegetables was determined by measuring and analyzing their physicochemical indexes. The results showed that the mixed fresh-cut fruits and vegetables treated with 5% O₂+5% CO₂+90% N₂ had higher sensory quality, lower weight loss rate, good color and hardness, and slow decrease of soluble solid content, with the inhibition of microbial growth after 8 days of storage. The results showed that the fresh fruit and vegetables mixed with carambola, Dangshan pear, cucumber and wheat grass were kept fresh by gas conditioning packaging, among which 5% O₂+5% CO₂+90% N₂ was the best.