Abstract: The Shouchangjiang Basin, located in the Hangzhou city Zhejiang province, is a typical humid area. This basin has been frequented by typhoon,Meiyu and other heavy precipitation. There are many small reservoirs scattered in the basin, therefore, the natural rainfall-runoff process has been altered. Taking Shouchangjiang Basin as an example, based on the demand of visual modeling, combined with the GIS theory and tools, the traditional Xin'anjiang model, the regulation and storage of small reservoir group, as well as the modules of basin flood prediction and real-time correction are integrated into a whole to form a basin flood prevention prediction system, which improve the accuracy of basin flood prediction. It also provides methods for flood prediction of similar areas.