Albic,black,clernozem,and saline soils are main cultivated soils in Jilin.Albic soils are distributed over the east mountain and semi-mountain areas where there are higher relief,warm climate and more rainfall,and the soil is strongly eluviated.Chernozem and saline soils are dominated in the west plain where climate is dry,transporation is higher than precipitation and the sails are weak in eluviatiom.Black soils are Located in the central part of Jilin with transitianal climate regime between above two group of soils.The parent materials of these soils are mainly accumulative materials during different periods.Based upon some references,hydromica was dominant in the top layer of bath black soils and alhic soils,but the latter contained a small amount of kaolinite and amorphous materials.The authors considered that clay minerial components of soil are different due to the difference of environmental conditions although soils may be derived from the similar parent material or even belong to the same great group.The results show that clay(<0.002 mm) contents in the above mentioned four soils were albic soil (440 g/kg) black soil (314 g/kg)>saline soil (309 g/kg)>chernozem (119 g/kg).But when the cumulative-frenquency was 500 g/kg,a opposite sequence was found being albic soil (3.1 μm)2/Al₂O₃ molar ratio ranging 3.73 and 4.38.The higher SiO₂/Al₂O₃ molar ratio as compared with red soil and yellow soil means weak weathering and desilificanon process and more 2:1 clay minerals in these soils.