City simulation is drawing more and more attention to itself for its unprecedented human - computer interactivity, sense of real building space and large area of 3D terrain simulation. The big scenario 3D terrain construction simulating the true environment is especially widely used in territory monitoring, military, and environmental protection. Based on the terrain component of the 3 D modeling software Creator Pro V3.01 ,this paper i~troduces the basic principle of 3D terrain generation and discusses the method of creating terrain in Creator Pro V3.01. It establishes big scene 3D terrain model with good visual effect,and then renders and drive the resulting model.%城市仿真以其前所未有的人机交互性、真实建筑空间感、大面积3维地形仿真等特性越来越受到人们的关注。特别是对真实环境模拟的大场景3维地形建设，在国土监测、军事、环境保护等方面应用非常广泛。本文结合3维建模软件CreatorProV3．01中的地形模块，介绍了3维地形生成的基本理论，讨论了在CreatorProV3．01中构建地形的方法，并以蓟县山区地形数据为例，建立了视觉效果较好的大场景3维地形模型，最后进行了渲染和驱动。
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