Abstract: Function-based hydrogeomorphic classification of wetlands is an approach to evaluation of physical and chemical properties,ecological functions and human disturbance of wetlands.With the aid of the spatial analysis function of the ARCGIS software(version 9.0),wetlands in the Naoli River Valley were evaluated and classified into hydrogeomorphic units,using analytic hierarchy process and fuzzy selection theoretic model.Results show that the wetland ecoregions in the Naoli River Valley plain could be sorted into categories,i.e.riverine,depression,slope and microknoll and that their human disturbance intensity were 0.043 2,0.093 0,0.397 6 and 0.937 4,respectively,showing an rising trend.Riverine and depression,light in human disturbance,accounted for 50.09% of the total acreage of wetlands,slope,moderate,for 17.42% and microknoll,severe,for 32.49%.Currently,the wetland stays good in function.

Key words: hydrogeomorphic classification, analytic hierarchy process, fuzzy selection theoretic model, wetland disturbed assessment