In recent years, China's urban modernization is developing rapidly, and the urbanization process and urban development speed are accelerating. Using computer technology to realize three-dimensional city visualization system has become an important tool and efficient means for modern urban planning and construction. In order to understand the current situation of the city more quickly and intuitively, and master the city's dynamics, this system collects information data of various aspects of the city, such as the distribution of buildings, urban traffic, air quality, residents' distribution, etc., and uses virtual reality technology to construct an immersive 3D virtual city system, through which the city can be managed and planned.