This paper introduced the concept of Virtual Reality (VR) technology and it''s development. Aimed at planning and designing large-scale public buildings in the existence of the investment risk, environment, landscape and public participation and other issues, combined with virtual reality (VR) technology to explore the practice of a large-scale public construction planning and design of scientific theory, the paper carryied out the research on virtual reality technology for large-scale public buildings in the plan of dynamic analysis for key technologies and innovations. The paper displaied virtual reality technology in urban plan and design of public buildings with broad prospects of application and provided a better scientific means for the optimal design, planning demonstration, display and public participation of public building of city.