In this paper, the basic theories and algorithms of virtual reality technology are studied, and the key technologies for drawing outdoor large-scale virtual scenes, realistic terrain simulation, virtual sound field simulation, and traffic layout in the construction site, three-dimensional road design, and dam construction simulation Visualization has been studied, and the system simulation information and graphics are closely combined to provide a new environment for the design and management of water conservancy and hydropower projects, and to provide decision-makers with a more scientific and intuitive basis.