Abstract: The rapid development of water sector information technology has provided technical support for the intelligent scheduling of urban river network engineering groups. This paper takes the Great Enclosure of the central unban area of Suzhou city as an example to construct a digital twin platform with a water sector model as the core, aiming to solve problems such as urban flood prevention, drainage, and intelligent scheduling of the water environment. The platform is driven by perceptual data, takes the model as the core, takes remote control as the means, and takes hydrodynamic and water quality as the goal, to construct a river network hydrodynamic model. The model calibration and verification are carried out for actual heavy rain conditions, with water level errors less than 5 cm, meeting the operational requirements of business. Based on the "FEDE"(forecasting, early warning, drilling, and emergency plan) business system, combined with the actual situation of Suzhou city, and the combination of different boundary conditions and working conditions, a set of scheduling plans for flood prevention, drainage, and water environment are developed. The optimal methods for flood prevention, drainage, and water environment scheduling is proposed with multiple objectives as decision variables, and a water sector "FEDE" business system is constructed to improve the level of intelligent scheduling of urban flood prevention, drainage, and water environment, drive the development of intelligent water sector, enhance the capacity of regional water security, and achieve the goal of governing water for the people and revitalizing water for the benefit of the people.