Abstract: Knowledge platform is an important part of the digital twin basin, whose role is to drive the intellectualization of the digital twin basin with water sector knowledge. However, how to build a water sector knowledge platform that meets the needs of the sector lacks experience and mature cases for reference. In view of the FEDE(forecasting, earlywarning, drilling, and emergency plan) needs of the floodmanagement in the river basin, combined with the specific construction experience, this paper explored the construction route of the digital twin river basin knowledge platform for the flood management FEDE, elaborated the construction content from the aspects of the knowledge platform framework, knowledge base, knowledge engine, knowledge platform software, etc., summarized and analyzed the key technical features, explored the specific application scenarios of the FEDE projects for flood management, and finally summarized and discussed the problems faced and the possible development direction in the future, With a view to providing reference for relevant needs.