Abstract: In response to the problems exposed by the "23·7" basinwide extreme flood in the Haihe River, and centering on the actual needs of flood control and dispatching work in Tianjin City, following the principle of "demand driven, application oriented, digital empowerment, and capacity building", and taking the path of digital scenarios, intelligent simulation, and precise decision-making, the construction of the Flood FEDE(forecasting, early warning, drill, and emergency plan) Operation Platform in Tianjin City, which integrates three major businesses of mountain flood disaster FEDE, urban flood control and drainage, and basinwide flood control and dispatching, is carried out. Strengthen the FEDE measures, connect the "Four Situation" defenses (rain, water, danger and disaster situation), create the "Four Chain" processes (rainfall-runoff generation-runoff concentration-flood routing, basinwide-main stream-tributary-section, total volume-peak flood-process-dispatching, technology-materials-teams-organization), build a flood control matrix that reaches vertically to the bottom and horizontally to the edges, achieve three-dimensional monitoring, accurate prediction, intelligent warning, dynamic drilling, and effective emergency plans, and form an allround and three-dimensional flood control system of "preventing upstream floods, draining mid-stream waterlogging, lowering downstream storm surges, and defending northern mountain floods". Comprehensively improve the level of basinwide flood control and dispatching, and lay a solid foundation for building a secure barrier against flood disasters.