The effect of treatment with 1-MCP on reactive oxygen species(ROS) metabolism on Korle fragrant pear at room temperature was studied.The fresh-keeping effect of the treatment with 1-MCP at room temperature provided a theoretical basis for room temperature storage of Korle fragrant pear.After treating with 1 μL /L 1-MCP,pears were then stored at(20 ± 1) ℃ and 80% ~ 85% RH.The reactive oxygen species metabolism related enzymes were determined on O2-.production rate,hydrogen peroxide(H2O2) content,malondialdehyde(MDA) and the activities of superoxide dismutase(SOD),catalase(CAT),peroxidase(POD).The results showed that fruit treated with 1μL/L 1-MCP could delay the declining of CAT and POD activity,maintain SOD activity,decrease the generation of O2-.and accumulation of H2O2 content,inhibit the accumulation of membrane lipid peroxidation product malondialdehyde.The oxygen damage to the cell membrane was reduced,and therefore,senescence during storage at room temperature in Korle fragrant pear was delayed.