Abstract: According to investigation and analysis of the present soil management in plastic greenhouse of different ages in Kunming suburban, and pot experiment of salt controlling on the serious salt affected soil, the formation of soil salinization under protected condition and regulation effect of regulator on soil salt were studied. The results indicate that with the increasing of the greenhouse ages, the soil salt content of plough layer increases, the component of salt most are Ca²⁺, NO^-₃, and the salt profile model in soil profile of 0～60 cm was from straight canister to inverse triangle. The soil regulator which is made up of zeolite, peat, saw dust and straw can reduce salt content significantly, and the decrease of total salt content in plough layer is between 19%～32%.