Abstract:The new variety of apple，Yueguan，was used as test material. The postharvest apples with the cling film of 0.04 mm thickness packaging were treated by 1-MCP with different concentrations and were stored at low temperature （0±1）℃. Effects of 1-MCP treatment on postharvest physiological changes and the activity of Antioxidative enzymes of Yueguan apple were investigated. The results showed that compared with the control fruit，1-MCP treatment had obvious effects for the fruit in lowering respiration rate and ethylene release. 1.0，1.5 μL/L and 2.0 μL/L treatment of all delayed the appearance of respiration peak and ethylene peak of fruit for 15 d. Moreover，1-MCP also increased the accumulation of proline. At storage 120 d，the treated was respectively 1.10 times，1.53 times，1.39 times and 1.36 times than the controlled. 1-MCP inhibited the increase of cell membrane relative permeability，and maintained the higher activity of catalase，peroxidase and superoxide dismutase of the fruit during the late period of storage than those of the control fruit. The appearance of activity peak with the last three treatments was 15，15，30 d later than others. So，the process of fruit caducity was postponed. Comprehensive analysis of all the indexes showed that the storage effect of Yueguan apple with 1 μL/L 1-MCP treatment was the best.