Abstract: For many years, Anhui Province has continuously made efforts in three aspects:the "three lines of defense", the group measurement and prevention systems, and the "FEDE(forecasting, early warning, drilling and emergency plan)" capacity construction, continuously improving the ability to defend against mountain flood disasters.In response to the key and difficult problems in improving the "FEDE" ability of mountain flood disasters, such as low prediction accuracy, inadequate implementation of the "call-response feedback" mechanism, and insufficient targeting of early warning for mobile personnel in mountainous areas, explore technical paths to solve these problems.On the basis of realizing the universal functions of "FEDE" in digital twin small watersheds, innovative applications are carried out in distributed hydrological models, progressive warning throughout the process, intelligent AI voice "call-response", LBS targeted warning, digital scene rehearsals, etc., effectively empowering and increasing efficiency for mountain flood disaster prevention and control through digitization and intelligence, and comprehensively improving the level of refinement in mountain flood disaster prevention and control.