Hydraulic engineering visualization simulation increases the predictability of engineering design work, engineering design and construction to reduce costs, and reasonable arrangements for construction projects of important guiding significance. This paper studies the three-dimensional visual simulation based on VR major water conservancy projects, the establishment and consolidation method describes the terrain and surface features digital models, finally introduced to interact with three-dimensional digital model and actual project can develop a scientific, intuitive, vividly show the construction of large water conservancy visualization simulation system, the proposed water project by the data acquisition simulation system structure, composition data management, simulation and virtual reality four parts, provide the basis for the construction management decisions.