Abstract: In this paper,the effect of high oxygen treatment on respiratory rate and quality of mulberry during storage time were discussed.Freshly harvested mulberry( Mours alba L) were placed in jars respectively with air,25% O2,50% O2,75% O2 and 100% O2 at 5℃ for 10 d,and its respiratory rate and main qualities were detected.The results indicated that high oxygen treatments could significantly reduce the respiratory rate,the decay index,weight loss,while significantly improved its hardness and the contents of titratable acidity,soluble solids,vitamin C,total phenolic substances and flavonoids,of mulberry in the storage time. The effect were increasingly significant with the oxygen concentration increases.