Objective: The effect of 1-MCP and ⁶⁰Co-γ irradiation on the quality of plum during postharvest storage was investigated. Methods: In this study, the plum was treated with 1.5 kGy ⁶⁰Co-γ irradiation，and then was fumigated with 1 μL/L 1-MCP. The rot ratio, water loss ratio, malondialdehyde content, relative conductivity, total soluble solids content, titratable acid content, V_C content, CAT and POD, and SOD of activity were to reveal the effect were measured. Results: The results showed that 1-MCP combined with ⁶⁰Co-γ irradiation treatment could effectively inhibit rot and water loss ratios and maintain hardness, total soluble solids, titratable acid and VC content. Consequently the malondialdehyde content increasing and relative conductivity were delayed. The activities of CAT, POD and SOD were significantly increased. Conclusion: 1-MCP combined with ⁶⁰Co-γ irradiation treatment can effectively maintain the storage quality of the plum and then prolong its shelf life.