Abstract: 【Objective】【Method】The changes of O2-. content, H2O2 content and MDA content, and the activity of SOD, POD and CAT in banana fruit peel and flesh treated by 100%O2、60%O2、40%O2和21%O2 were investigated. It was tested that high O2 accelerated the production of O2-. and H2O2 in banana fruits , as activated the activity of SOD、POD and CAT in banana fruits during the pre-phase of storage.【Result】As large accumulation of superoxide anion and hydrogen peroxide exceeded the capacity of antioxidant enzymes, removing active oxygen, lipid oxidation was activated and MDA content of fruits rapidly increased,【Conclusion】accelerating the senescence of banana. With the growth of O2 concentrations, the effects became more significant.

Key words: high oxygenbanana, active oxygen, antioxidant enzyme