The level analysis is the modern and new method to analyse and dia- gnose a system,which is a combination of qualification with quantifi- cation.When analysing Beihe small watershed systematically we cluster and group all the factors and establish models of level analysis.The ana- lysing results show that the effecting extent of nine factors to environ- ment worsenning of the watershed,soil and water loss and poorness of economy could be lined as,condition of land utilizationsoil texture climatic conditionvegetation conditionanimal resourceresoure of labour powerculture and educationgeomorphorlogical typegeological tectonic.Thus,it is suggested,firstly,to adjust the proporiton of lands for farming,forestry,husbandry and sideline production,to improve soil structure and raise land productivity,meanwhile,to construct ins- tallations of water conservancy,to accelarate greening and to enlarge vegetation when drawing up harnessing plan.