Abstract: In view of interlaced tributaries,and the abundant of reserwir,dams and water gates in the Huaihe river,a coupled numerical model for 1D and 2D water quantity and quality is developed to meet the requirement of flood regulation and the water pollutants' contml.The established model is calibrated and tested by the real time data of Huaihe river in 1999 and 2004,respectively.The results suggest that this model can provide precise description of the movement trend in the flood and the pollutants,and can be used for the prediction and assessment of the effects of each regulation scheme on the water quality improvement.