Effect of treatment with 0. 4 μL /L,0. 8 μL /L or 1. 2 μL /L 1-octylcyclopropene( 1-OCP),compared with that of treatment with 0. 8 μL/L 1-MCP,on storage and preservation of green mature 'Fentailang' tomato fruits( Solanum lycopersicum L.) at low temperature( 3 ±1℃) were investigated. The results show that all 1-OCP treatments,similar to the effect of 1-MCP,delayed ripening and senescence process of tomato fruits in various degrees. Treatment with 1. 2 μL/L 1-OCP showed better effect than other concentrations,with fruit hardness,vitamin C,soluble tannin,soluble sugar and soluble solid of 73. 5%,66. 7%,40. 6%,33. 0% and 7. 7% higher than that of control,respectively. Methane dicarboxylic aldehyde( MDA) content and super oxygen dehydrogenises( SOD) activity peak value of the fruits treated with 1. 2 μL/L 1-OCP were 90. 7% and 106% of control,respectively.