Abstract: According to Kaifeng West Lake source water-the Heigangkon Reservoir drainage data, with the Kaifeng West Lake topographic condition, interpolation and fitting mathematics theory, by using the Flow-3D software to model and calculate,then to analyze the relationship between sediment concentration and time, flow.After getting the total sediment yield and space distribution, it finally predicted the future water and sediment distribution and trend analysis of Kaifeng West Lake.