Abstract: The oriental lily ’Siberia’ was used to study the effects of 1-methyleyelopropene 1 -MCP on membrane permeability, ethylene, malondialdehyde and soluble protein of lily. The results showed that the development and senescence of cut flowers were delayed,the vase life of lily was lengthened and the appearing time of ethylene peak was postponed after treatment with 1-MCP. The cytomembrane permeability, ethylene peak and malondialdehyde content of plasma membranes could be reduced with the treatment of 1-MCP, but had no effects on soluble protein content of oriental lily. The results also showed that the 1-MCP had some effects for fresh-keeping of lily. The optimum concentration of 1-MCP was 0.01 μL/L. Meanwhile, the most effective concentration treatment can offer help for the 1 -MCP application in lily postharvest and enhance lily cut flowers quality and economic efficiency.