Abstract: The 3D information model is the foundation of the whole life cycle management of the engineering projects. However,at present,the 3D geological model and the 3D information model of the projects are usually difficult to be unified due to the differences of data structure. Most of models only can be used for "visualization". They are difficult for "simulation" and "analyzation". In addition,due to the complexity of geological structures,a lot of simplifications are usually used in 3D geological modeling. Based on the advanced 3D modeling technology,this paper proposes a modeling method of 3D geological model and 3D model of building structure,realizing fast and refined modeling of 3D model. The established models are unified under standardized 3D model files such as^*.stl,^*.obj and^*.igs,which can be conveniently used for 3D model visualization,analyzation and subsequent numerical simulation in different scenarios. For the construction of large hydropower projects,the framework of hydropower project information model(HIM) is proposed and applied to Suofengying Hydropower Project. The fromwork realizes the fusion and information of the BIM of the dam and the refined 3D geological model of the four landslides. The studies in this paper are of great significance for the realization of information management,stability analysis,potential disaster assessment and prediction of hydropower projects.