Results of the study on five soil profiles collected from west Liaoning showed that the soils developed on granite gneiss, red clay, loess and purple shale were rich in hydramica and smectite in their clay fraction. The smectite was mostly interstratified. In addition to detrital inherence of chlorite in loess, there had been chloritization of vermiculite in some soils. No apparent differentiation of clay minerals was found in the profiles. The composition of the clay minerals in soils was quite identical with their cation exchange capacity.