For study of factors affecting soil. salinization, modelling experiment by soil columns was conducted in laboratory. The factors invertigated included salinity of ground water, organic matter content in plow layer of soils and patterns of solum structure.. The experiment results showed that (1) there was a positive correlation between salinity of ground-water and salinization of soil; (2) soil organic matter could inhibit the salinization of soil, theeffect of soil organic matter on soil salinization was observed when the soil organic matter content was above 1.5%; (3) the effect of intercalated layer of clay in soil profile on the inhibition of soil salinization depended upon the depth of the clay layer and its position in profile, the effect was getting significant with the increase of its depth and rising of its position.