In this article.the author disscussed that the variability of soil erosion intensity on the loess plateau is very large,sometimes is very strong·and sometimes is very light in the endless geology periods firstly. Baased on the Ziwuling example which soil erosion intensity from strong to light·and many soil and water conservation comperihensive harness advanced modeds .it is explained that soil erosion of the loess plateau can be harnessed totally. So only by soil and water conservation is it the major fundamental measure of bring the yellow River water damage under permanent and bring about agricuture sustainable development of this region.