Abstract: The multi- disciplinary, multi- scale and multi- level information involved in flood management and disaster reduction needs the support of digital watershed. With the development of new technologies such as tilt photography, virtual simulation, BIM, digital twin, intelligent perception, the display form of digital watershed has been upgraded from 2D map to 3D scene. Firstly, the application and development of mainstream 3D platform in China are reviewed, and the characteristics of several mainstream 3D platforms are compared and summerized based on the results of literature retrieval; Then, combined with specific cases, the relevant practice and application of 3D digital watershed for flood management and disaster reduction in China are sorted out, and the process is divided into development, stable period and peak periods, and it is pointed out that there are still some problems such as insufficient standards and specifications, insufficient model coupling and poor simulation effect at present; Finally, the future development direction of 3D digital watershed for flood management and disaster reduction is prospected, and three application directions are proposed which are 3D digital twin watershed, water movement process simulation and intellectualization The analysis methods and conclusions can be used for reference by relevant professionals and technicians.