The effects of different salt stress on the plantheight,diameter,yield and quality of cucumber were studied for two consecutive years in four bases in Fangshan and Daxing district ofBeijing.Soil electrical conductivity(EC)was used as anindicator,and the salt stress treatments were 0.21 dS·m-1for treatment1(T1),0.375 dS·m-1for treatment2(T2), 0.532 dS·m-1for treatment 3(T3),0.914 dS·m-1for treatment 4(T4)and 1.108 dS·m-1for treatment5(T5).The result showed that the safe value of soil salt for cucumber seedlings was between 0.25～ 0.8 dS·m-1,in which the plant height and diameter may reach the bestlevel.When the EC value was in the range of 0.5～ 0.8 dS·m-1,the cucumber yield and vitamin C content increased with the increasing of soilsalinity.While when the EC value was greater than 0.8 dS·m-1, it decreased with the increasing of soilsalinity.The change of nitrate was on the opposite withthem.The safe range of soil salt for cucumber during the whole growing period was 0.5～ 0.8 dS·m-1,which may ensure both the high yield and quality ofcucumber.Soil salt content negatively correlated with cucumberyield(y=-123.76x+164.86,r=0.870, P=0.002).When the soil salinity is increased to 0.8～ 0.9 dS·m-1,or even more than 1 dS·m-1,it may cause a 20%～ 60% yield reduction in cucumberproduction.