Abstract:In view of the problem that citrus was not easy to store after mining，the Quzhou varieties in Zhejiang Province were used as experimental materials，using hot water，ozone，hot water＋ozone.Treatment of citrus，studied of hot water co-ozone on the post-harvest storage effect of citrus.The results showed that compared with the control group，the other three groups could reduce the decay rate of citrus，ensure the value of citrus commodities，reduce the glycolic acid ratio（TSS/TA），maintain citrus maturity and flavor quality，improve the activity of citrus peroxidase（POD）and superoxide dismutase（SOD），and delay mature aging.The effect of hot water＋ozone treatment on the preservation of citrus after harvest was significantly better than that of hot water treatment（P＜0.05）and ozone treatment（P＜0.05）.After 75 days of storage，the decay rate of hot water＋ ozone treatment was 0.49 times lower than that of control group，hot water treatment and ozone treatment （P＜0.05）and 0.58 times （P＜0.05），respectively；TSS/TA was 9.75 and 5.94 lower than hot water treatment and ozone treatment，respectively；POD activity was 31.12 U/g·FW；SOD activity increased 2.63 U/g and 2.01 U/g than hot water treatment and ozone treatment，respectively.Thus，hot water，ozone and hot water coordinated ozone treatment could maintain the flavor of the citrus and commodity quality，and hot water coordinated ozone.