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[目的]了解挥发酚类、锰、氨氮污染物在取水沟槽中自净进程的变化规律，为受污染水的处理提供科学依据。[方法]就我市某水厂水源水污染连续监测数据，对挥发酚类、锰、氨氮污染物在水厂取水沟槽内浓度变化进行了动态观察，按环境质量指数评价方法进行分析。[结果]挥发酚类指标变化迅速，11天达地表水环境质量标准Ⅱ级，氨氮次之达16天，锰污染指标变化迟缓达19天。3种污染物分指数与污染物衰减天数均呈直线回归，回归系数f检验差异均有极显著性(P＜0.01)。[结论]3种污染物自净进程都非常缓慢。且水位变化对水体中锰污染浓度影响最明显，环境挥发因素对取水沟槽挥发酚类和氨氮污染物的自净有重要影响。“,”[Objectie] To find out the regularity of the self-purification processes of the pollutants, such asvolatile phenols, manganese and ammonia nitrogen in the water of collection ditch, and provide scientific basis for thetreatment of polluted source water. [Methocls] The dynamic observation on the changes of the levels of volatile phenols, managese and ammonia nitrogen in water of collection ditch was carried out based on the continuous monitoringdata on pollution of source water of a water plant in Wuhan. Then the obtained data were analysed according to themethod of environmental quality index (EQI) assessment. [Results]It cost 11 days to reduce pollutant concentrationsto the environmental quality standard of surface water Ⅱ grade for volatile phenols, 16 days for manganese and 19days for ammonia nitrogen. The good linear regressions for 3 pollutants were observed between sub-EQIs and attenuation durations of each pollutants with a very significant regressive coefficient (P＜0. 01). [Conclusion] The speedof self-purification processes of 3 kinds of pollutants were very slow. The changes of water levels in collection ditchwere the main factors affecting the pollution concentrations of manganese in water. Volatile factors were the maincause affecting the self-purification of volatile phenols and ammonia nitrogen in water of collection ditch.