Terrain is an important part of the regional environment,and 3D terrain analysis provides a new technical support for the study of the surface evolution process.Based on the multi-stage underwater topographic survey data of phase II project of Heisha River channel regulation,and adopting BIM technology,we realize the 3D visualization of underwater terrain surface of each stage,and carry out dynamic monitoring and analysis of it.The research shows that based on the BIM technology,we can realize the spatial monitoring of the underwater topography of the waterway,which can show the 3D situation of the regional terrain evolution and sediment deposition visually,which is of great significance for the maintenance and renovation of the waterway.