The eroded soils are widely distributed in the Loessial hilly region of China, which is the direct result of water and wind erosion. As the result of development of the eroded soil, the surface layer of a soil became thin, infertile, and even barren finally. Therefore, it is greatly harmful to agricultural production. The eroded soils are generally classfied by the thilcness of eroded soil or that of soil layers remained. The principal components and stepwise discriminatory analysis are based on the data from the field observation and numerical coding. In this study, four important factors(erodibility, slope, intensity of land utilization and damage from unreasonable land utilization) which influenced soil erosion were used as variable for calculation.