论述了地形、城市建筑物以及其他附属设施的三维模型建立方法；探讨了三维对象模型与地形模型 的匹配问题；分析了虚拟建筑群的三维可视化过程；采用三维可视化技术，实现了某建筑群的三维建模与可视 化表达，具有很好的实用性，为进一步进行数字城市的三维建模及可视化设计提供了一种辅助手段。

3D modeling methods of terrain,  city structure,  highway and other attached establishments are presented in detail.  Taking into account the matching of 3D object with terrain model,  the visualization processes of digital city are analyzed. 3D modeling and visualization of residential district are realized. Practical application shows that this approach has good adaptability and provides a new supplementary means for 3D visual design of digital city.