Soil erosion lead to soil degradation, land productivity decline, even threat the ecological environment of human production and living. Therefore, the research of soil erosion law is always the key technology in the natural sciences field for many years. At the beginning of the 50's, the Yellow River Commission has began to set up station network of small basin soil erosion with different erosion types and observation factors in the loess knoll gully area first sub region, so far more than 60 years original observational data have been collected. The observation always been manual labor, the data are of rainfall-runoff-silt characteristic point source, but each rainfall erosion is a continuous natural process, manual monitoring is lack of continuous and systematic in the position and the monitor data, causing the effects of soil erosion confined to a single factor or some factors and seriously affects the development of soil erosion systematic model in this area. So we introduced modern automated soil erosion monitoring systems in this area for promoting the soil erosion rule research, seeking the objective and real natural soil erosion data rule and speeding up soil erosion model in this area. Up to now, this monitoring process and the date analysis has been lasted for 2 year, not only saved a large number of human and material resources but also gained objective, good accurate, continu- ous and dynamic data of the soil and water erosion process which has a positive role to promote the research of soil and water erosion law in this area.