Xiluodu hydroelectric plant is the biggest plant to be built on Jinsha River, and also, Xiluodu project is the biggest hydraulic engineering in China except Three George Project. To intuitively and accurately describe the complex and dynamic spatial relationship among all sides interfered in construction layout design of Xi Luodu project, the construction layout system is divided into 6 subsystems： dam construction, diversion and enclosure construction, dynamic water flow, underground structure construction, quarry stacking and redigging, and road and traffic inside construction site, and the research on 3D dynamic visual graphic simulation for construction layout of the designed whole construction process is developed. Flow of the 3D dynamic graphic simulation data is designed. Dynamic graphic simulation data can be divided into graphic data and attribute data, which organized based on GIS, then, 3D dynamic visual digital model for construction layout is built, which itself is an important part of digital hydraulic engineering. 3D dynamic visual graphic simulation demonstration and visual inquiry of dynamic graphic simulation data are realized with this digital model. Practical engineering application shows that a scientific and intuitive visualization analysis way is provided. for construction layout design and decision-making by this research, moreover, hydroelectric design work will be promoted to develop in an intellective and modern way, and the research is worth to be spread.