Abstract: In the present study, the effects of 1-methylcyclopropene（1-MCP） combined with different modified atmosphere fresh-keeping bags on the storage qualities of Tahiti lemons from Ruili were investigated. These lemons were treated by different concentrations of 1-MCP（0, 62.5, 125.0, 250.0 mg/L） combined with PBI fresh-keeping bag and microporous membrane, and stored in a 15 ℃ incubator, then the weight loss rate, hardness, soluble solid content, respiratory intensity, VC content, peroxidase（POD） activity, titratable acid and other related indicators were determined regularly（every 3 days）, and the preservation effects of different treatment groups were compared.Results showed that the treatment of 62.5 mg/L 1-MCP combined with PBI fresh-keeping bag could effectively inhibit the decrease of hardness, weight loss rates and VC contents of lemons; and 250.0 mg/L 1-MCP treatment combined with PBI fresh-keeping bag could efficaciously suppress the decrease of soluble solid contents of lemons. Considering the production cost and other factors, the 62.5 mg/L 1-MCP combined with PBI fresh-keeping bag was determined as the superior fresh-keeping method for Tahiti lemons.