Abstract: The large concrete dam construction is a complicated systematic project, the computer simulation technology can provide massive data for engineers, how to demonstrate the dam pouring process vividly and provide real-time computer query are keys to the success of optimal simulation system. A RCC dam construction process visualization simulation is developed by introducing the widely used open source graphics engine OGRE. The system development created an integration model of three-dimensional visualization and numerical simulation system, which can synchronously update the visualization system with construction scheme change without the demand of rebuilding the model. The system also improves the reality sense of visualization module through simulating scene effects by particle system and the OGRE-based improved roam function makes the virtual scene interaction more friendly. The practice shows that the system can intuitively reflect the spatial and temporal states of various parts of buildings and provide a powerful tool for construction organization and design.