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With the rapid development of domestic economy and the growth of population in China, shortage of water resources, deterioration of water environment and soil and water erosion have become more and more serious.The construction of ecological-clean small-watershed is to build three ecological fronts by which a small watershed from the mountaintop to the river valley is divided into the ecological restoring area, the ecological improving area and the ecological protecting area.Due to the complexity and fuzziness of three ecological fronts, the fuzzy comprehensive analysis method is adopted to regionalize three ecological fronts with the indices of vegetation cover rate, gradient, population density, human activities intensity and water quality.The case research is researched in the Xuyuan small watershed, and the fuzzy regionalization result is consistent with the qualitative analysis.This research is to provide reference and technical support for ecological-clean small-watershed construction.