In order to evaluate the impact of west bank control engineering on flood control in the area of WangYu River, the paper took the west basin of Wangyu River as the study area and based on hydrological characteristics to constructe the MIKE11 hydrological and hydraulic model which was suitable to simulate runoff process of a river network plain area, and to use the local rainfall and water level measured data to calibrate.Through simulating the fifferent conditions of designed storm one every 50 years,the paper got the change situation of water level each node in the river network.According to the calculation, and analyzed the impact of west bank control engineering on flood control in the west area of Wangyu River.The results showed that the highest water level of important node in the study uplift distinctly, some places are in risk of flood submerging.MIKE11 hydrological and hydraulic model has a high application value on analyzing the influence of water gate control in the river network plain area.