Tile alkali soil is one kind of alkalized light meadow soils in the Northern Plain of China. It is characterized by high pH value, low concentration of soluble salts, and crusting of surface soil under drying condition. The crusting of surface soil is a serious hazard to seedling emergence, and the high pH value of the soil affects the growth of crop plants. These properties of the soil are related with the high percentage of exchangeable sodium on the colloids of the tile alkali soil. For the improvement of the colloidal properties of this soil, it is necessary to displace the excess exchangeable sodium on soil colloids with calcium (CaSO₄,organic matter and sulphur). Breaking the crust mechanically improves the soil physical properties only temporarily.