Mengba river watershed is located in the south of Zhijin county, Guizhou province,the upper reaches of Sancha river,a main upper tributary of Wujiang river source.Since 1986, various comprehensive administration measures, including biological ones such as afforestation and closing hillsides to facilitate afforestation and engineering works such as vally dams in the watershed have been designed and implemented. And observations in a hierarchical way to evaluate the effect on hydrologic processes and soil and water conservation have been carried out.