In the loess plateau, the silts in soil are rich, and the clay particles and organic matters are lack, the soil structure is easy to be disrupted by water, and the soil noncapillary pores are easy to be blocked up by dispersion particles in the process of rainfall. Meanwhil it will lead to the decrease of soil permeability and remarkable increase of surface runoff. Therefore, the soil erosion are very serious on both the loosened soil with weeken anti-scourabilty and the compacted soil with poor permeabilit...