Miyun Reservoir is located to the east of Beijing with a waterarea of 188 km2 and water vulume of 43.75 billion m3. An investigation was conducted from 1996 to 1998. The triennial average biomass of phytoplankton was 1.05 mg／L, and its peak appeared in June and August. Bacillariophyta and Chlorophyta predominated during the 3 years; the triennial average biomass of zooplankton was 1.87 mg／L and the peak was in June, August and September, and the predominating species was Copepoda; the triennial average numbers and biomass of zoobenthos were 2 478.05 m-2 and 19.76 g／m2,respectively, and the peak was in December. The potential fish productivity was estimated approximatly 2×106 kg on the basis of the biomass of plankton.%根据密云水库1996～1998年浮游生物、底栖生物的生物量、组成和季节变化，对其所能提供的滤食性鱼类的鱼产力进行了粗略的估算。调查结果表明：浮游植物生物量各站点平均值为1.05mg／L，最高峰出现在6月和8月，优势类群为硅藻门和绿藻门；浮游动物生物量各站点平均值为1.87mg／L，最高峰出现在7～9月，优势类群为桡足类；底栖生物数量和生物量各站点平均值分别为：数量2478.05m-2，生物量19.76g／m2，最高峰出现在12月，优势类群为水蚯蚓(数量)和软体动物(生物量)。以浮游生物量粗略估算滤食性鱼类鱼产力为2×106kg。
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