Taking the Zhongxian Huanghuacheng river reach as an example ,the water quality changes in Three Gorges channel environmental dredging is simulated based on Delft 3D model .The results show that the dredging project has obvious impacts on water quality ,following the flow direction ,the pollutant concentration rises to be slower ,the pollutant concentra-tion has increased 245 mg/L at the dredging point ,about 20 mg/L 4 km away from the dredging point and about 14 mg/L at the end of the river reach respectively ;after the end of dredging ,the water quality of the river reach can be quickly re-covered ,the closer to the dredging point ,the faster water quality recovered ,the pollutant concentration can be mostly re-turned to the background value 1 day after the end of dredging and the impact of dredging project on water quality can be re-covered quickly .%以忠县皇华城河段为例，利用Delft3D数学模型对三峡航道环保疏的水质变化进行了数值模拟。结果表明：疏浚工程的进行对河道水质环境影响比较明显，随水流方向污染物质量浓度上升速率变慢，在疏浚点污染物质量浓度上升245 mg／L ，疏浚点下方4 km处污染物质量浓度上升约为20 mg／L ，河段末端污染物质量浓度上升约为14 mg／L；疏浚工程结束后，河段的水体水质能够较快得到恢复，离疏浚点越近恢复得越快，疏浚结束1d后污染物质量浓度基本已恢复到本底值，疏浚工程对水环境的影响可以较快得到恢复。
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