Abstract: Based on an overall investigation of the change of water conservancy project condition,water volume,water quality and pollution sources in the upper reaches of Rvier Huangpu before and after River Taipu dredging,a multivriant study on the water environment change was carried out,by adopting dynamic simulation methods for large-scale run-off and river-net water flow and small-scale water quality,to further reveal the changing rules of water environment in the upper reaches of River Huangpu,the main water sources in Shanghai.Both positive and negative effects of River Taipu dredging were comprehensively analyzed.The reasonable harnessing countermeasures were also presented to avoid the negative effects and to exploit the integrated benefits of River Taipu Project.