Abstract: In recent years, extreme weather events have occurred frequently in Chaohu Lake Basin of Anhui Province.Against this backdrop, enhancing the flood control and scheduling capabilities of key water conservancy projects like the Dongpu-Dafangying Reservoir, a tributary of Chaohu Lake, is crucial for establishing a digital twin water conservancy system that supports the "Four Preparations" (forecast, warning, drill, and contingency plan) for reservoir flood prevention.As the core module of the digital twin management and control platform, the intelligent dispatching system integrates flood control and water supply scheduling models to support accurate scheduling decisions. A coupling calculation model of typical flood dispatching and real-time dispatching of reservoirs considering the safety of downstream flood control and the safety of reservoirs and dams was established, a water supply dispatching model based on dual-objective optimization was established, and the flood control dispatching model wsa verified by using the data of "Zhengzhou Heavy Rainstorm on July 20", and the flood forecasting accuracy of the improved model results reached 80%, which was 60% higher than that of the traditional method, and the water supply dispatching model was improved.The establishment of these models can provide important technical and data support for the "Four Preparations" of reservoir flood control, so as to ensure the flood control and water supply safety of Dongpu and Dafangying reservoirs.