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Flood control is the main application field of the digital twin basin. The application of flood control in the digital twin basin not only needs to scientifically express the natural elements in the basin, but also needs to describe the characteristics of human activities. Virtual geographic environment integrates natural elements and human elements, focuses on building an immersive experimental and cognitive environment, and it provides a new perspective and method for the modeling of man-land relationship, flood scene expression and risk cognition in the digital twin basin flood control. This paper firstly introduces the concept and development status of the digital twin basin, as well as the characteristics of the virtual geographical environment, and then puts forward the technical framework of the digital twin basin flood control based on the virtual geographical environment, and explains the key technologies such as the construction of the digital basin scene, the state synchronization of the digital basin, the modeling and experiment of the flood spatial-temporal process, the human-land relationship modeling, the expression of the flood scene and the risk perception. Finally, the future development of immersive VR/AR application and public participation in flood control in the digital twin basin is prospected.