The above result of this research shows that the effect of Litaiping comprehensive small watershed management is significant.

The variation of water and sand is studied under the influence of the rainfall and human activity in the fore and aft er management of small watershed in gully region of the loess plateau.

In order to study the management of water environment in small watershed, the SWAT model is used to study Hufu watershed of Yixing city where the non-point output predominates.