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本文以王家沟流域作为晋西黄土丘陵沟壑区典型示范区，分析小流域在多年的综合治理情况下，影响其产流产沙的两大因素──动力和下垫面。根据两大因素之间各个因子的模糊特征，采用灰色关联分析法，得出目前小流域产流产沙的主要原因为草地的减少和沟道、沟坡、“V”形沟头的防治工程薄弱以及坡耕地的退耕还林速度慢，这些是今后重点治理防护区域，其次为降雨，最后是造林和基本农田。
Taking Wangjiagou watershed as a typical demonstration area of loess hilly and gully regions in western Shanxi Province, this paper analyzes the two major factors that affect the runoff and sediment yield of the small watershed under various years of comprehensive management - the motive force and the underlying surface. According to the fuzzy characteristics of each factor between the two factors, the gray relational analysis method is used to conclude that the main reasons for the runoff and sediment yield in small watersheds are the decrease of grassland and the weakness of prevention and control of channel, ditch slope and “V” shaped head As well as the slow return of cultivated land to forests on sloping cultivated land, which are the key areas for the protection of the protected areas in the future, followed by rainfall and finally afforestation and basic farmland.