Abstract: In view of the numerous hidden dangers and frequent dangers of dike projects in China,based on the characteristics of dike project construction and the needs of flood prevention and disaster reduction strategies,the design and implementation of a dike project safety management platform based on GIS+BIM+IoT digital twins is studied based on GIS,BIM,and IoT. The integrated digital twin technology is combined with the dike safety management,the digital twin data and model integration and visual expression methods are studied,the dike danger recognition deep learning model is established,and the dike engineering safety management platform based on the GIS+BIM+IoT digital twin is designed. The typical dike section of the Yangtze River main dike is selected for application demonstration. Compared with the problems of lack of information,insufficient accuracy,lagging feedback,and single expression in the past dike project database management or two-dimensional management mode,practice has proved that the safety management platform of dike engineering based on digital twins can realize the integration and interaction of spatial geographic data,BIM model data,and IoT data in various environments for simulation,decision-making,optimization,adjustment and visualization,its risk recognition effect is better than the traditional model. The research and design of the platform can carry out real-time monitoring,diagnosis,analysis,decision-making and prediction of the safety management of the dike project,realizing intelligent operation,precise control and safe operation and maintenance.