the distribution of soil ferility in Zhifang gully watershed is studied, The result shows①soil and water loss plays an important role in the impacting of land use,vegetation andartificial soil improvement on loess soil fertility;②soil and water loss also plays an important roleon the formation of main soil types;③the fertility distribution in the profile of loess soil,whichgrows on Heilu soil,is completely different from Heilu soil;④the fertility distribution in thewhole slope land of loess soil has the different propertys,namely,the fertility on upper slope ismore than that on down-slope