Tatung basin is situated in the Northern part of Shansi province.The genetic soil type is light chestnut earth formed under the dry steppe condition.The alkalized soils are scattered among the light chestnut earths on the higher river terraces,while on the depressed low terraces and in the flood plain large areas of saline soils arc formed under the high water table and mineralized ground water conditions.In the joint position of these two terraces the soda-saline soils are distributed.From the analytical data of ground water,soils and rocks,the soda is originated from the transformation of sodium silicates in weakly mineralized ground water as proposed by Professor Kovda.Moreover the analytical data also show that there are large quantities content of sodium compounds in the igneous rocks in the surrounding mountainous regions.This might be another origin furnishing large amount of soda to both ground water and soils.