Abstract: Basing on the pilot work of "forecasting-warning-previewing-planning "for flood control in the Huaihe River Basin, a pilot construction scheme and a new pattern of "forecasting-warning-previewing-planning" for intelligent flood control in the digital twin Huaihe River Basin were proposed. A series of technologies, including the digital twin data bottom plate, digital scene, digital flow field and digital mapping, real-time hydrodynamic simulation and forecasting technology based on high performance parallel computation, etc. were studied. Based on these technologies, the intelligent flood control system of Huaihe River Basin was developed. In the basin above Zhengyangguan of Huaihe River, the flood control of the basin has initially realizedthe"real-time forecasting and warning, digital scene realization of previewing performance, andfieldization of planning", which can provide a framework and case reference for the construction of intelligent flood control business application system of national digital twin basins.