[目的 ]了解和掌握大厂镇地区拟建取水口水源的水质情况。 [方法 ]在长江枯水期对该水源地按不同断面、不同层次、不同潮位及取水口断面不同位置的水样进行了监测 ,依据 GB3838- 1988《地面水环境质量标准》 类水质评价。 [结果 ]达标率为 90 .11%。超标项目为溶解性铁、五日生化需氧量 (BOD5 )、石油类、非离子氨和总大肠菌群。表层水样石油类含量显著高于中层和深层水样。不同潮位水样水质间无显著性差异。 [结论 ]该水源地枯水期水质基本达到 类标准 ,符合饮用水水源的卫生要求。 [Objective] To understand and master the water quality of the water intake of Dachang Town. [Method] Water samples of different positions, different levels, tidal levels and different sections of water intake were monitored during the dry season of the Yangtze River. Water quality was evaluated according to GB3838-88 “Groundwater Environmental Quality Standard”. [Results] The compliance rate was 90.11%. Over-standard items for the dissolved iron, five days of biochemical oxygen demand (BOD5), petroleum, non-ionic ammonia and total coliform bacteria. Surface water samples showed significantly higher oil content than middle and deep water samples. There was no significant difference between water quality at different tide levels. [Conclusion] The water quality in dry season of this water source basically met the standard of class, which met the hygienic requirements of drinking water source.