Abstract: In the middle of September 2005, the Dongyu River Basin in Heze City, Shandong Province, experienced a general heavy rain to rainstorm and local heavy rainstorm. The early rainfall caused the soil moisture in the basin to be basically saturated, and then the impact of rainfall was strengthened, leading to runoff generation in the whole basin. The Lucaiyuan Sluice Station on the main stream of Dongyu River and the Zhangzhuang Sluice Station on the downstream main stream of Dongyu River experienced the fourth and second largest flood processes since their construction. The spatial and temporal distribution of the rainstorm and flood characteristics are analyzed, and the hydrological law of the Dongyu River Basin is further studied, which can be used as a reference for water conservancy and engineering departments.