In order to study the influence of water dispatching of Hanfeng Lake regulating dam on the hydrodynamic and water eutrophication in reservoir area, MIKE21 two-dimensional hydrodynamic and convective diffusion model were constructed based on the data of actual measured flow, water level and water quality of Hanfeng Lake in 2014, and the accuracy of the model was verified by the measured data of flow velocity, concentration of TN and TP. In addition, the distribution of flow velocity, concentration of TN and TP in the 7 different schemes were simulated by this model. The operation conditions of all schemes were compared. The results showed that the large flow of water scheduling mode can effectively improve the water flow velocity in the reservoir area, and reduce the concentration of TN and TP in the regulating dam section in a short time. However, the decrease of nutrient concentration in the whole reservoir requires a certain scheduling time.