Abstract:The effects of chlorine dioxide（ClO2）and ozone（O3）on the changes of quality of flowering cabbage were investigated，including respiration intensity，malondialdehyde content，peroxidase activity and other quality indexes during the storage period.The results showed that，compared with the control group，during the storage period，ClO2 and O3 promoted and then inhibited the respiration of flowering cabbage，both of which made the respiration peak of flowering cabbage reach earlier，but the respiratory intensity of the sterilization groups was lower than that of control group storing for 6 d-9 d，and the inhibition of ClO2 on respiration was better than that of O3.ClO2 and O3 improved the hardness of flowering cabbage at the early stage，and the hardness of ClO2 group was moderate at the later stage.ClO2 reduced the a*value of flowering cabbage，which helped to keep the green color.O3 slightly increased the a*value，but had no significant effect on its green color.ClO2 and O3 promoted the accumulation of malondialdehyde in the flowering cabbage，but the small amount was difficult to promote aging.ClO2 could stably maintain low peroxidase activity，inhibit phenylalanine ammonialyase activity，delayed its lignification and aging，and maintained its quality.Comprehensive analysis showed that ClO2 was more suitable for sterilization of flowering cabbage，and its shelf life was up to 12 d，with potential application prospects.