The water-holding capacity monitoring for forest litter layer and soil layer is the significant measure to evaluate the water conservation efficiency of forest. In view of its water sources value function, by selecting 21 representative evaluation inde-xes that affect the water retention function of the two layers, an evaluation index system is built for water conservation function of different mixed forests in urban water sources areas in the basins of northwest Yunnan. The entropy method is applied to deter-mine the index weight, and the water conservation function of a typical water sources area is evaluated by fuzzy matter-element model and comparative progress. The result is consistent with the actual situation, and the Pinus yunnanensis and Cunninghamia lanceolata are the best plants for comprehensive water conservation function.%森林枯落物层和土壤层持水能力监测是判断森林水源涵养功能优劣与否的两个重要环节。从森林涵养水源价值功能出发，选取影响林地枯落物层和土壤层持水功能的21个代表性评价指标，构建了滇西北高原盆地城市水源地不同混交组合林水源涵养功能评价指标体系。采用熵值法确定指标权重，结合模糊物元模型和相对进步度对该地一典型水源地的水源涵养功能进行了评价。评价结果与水源地实际情况相吻合，即纯云南松和杉木综合水源涵养功能最好，其次为云南松+人工桉树林、华山松+青冈栎、纯华山松和云南松+华山松，人工桉树林最差。评价结果可为保山市北庙水源区的森林营造，退化森林生态系统的恢复提供基础数据。
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