Based on the current situation of the Taihu basin，uses mature numerical simulation technology to simulate and calculate the typical rainfall conditions in the 100 years for the new project-Xingou river of different project operation and scheduling schemes，then analysis the change of flood discharge flow caused by different scheduling schemes and the influence on the water level of Taihu lake，in order to provide reference for the formulation and optimization of Xingou river project and regional project scheduling.