3D modelling is an important way in simulating of historical building. Modelling methods based on laser-scanned data and automated image-based techniques are commonly used recently. In this paper, modelling method based on parametric description is proposed. One prominent feature of traditional Chinese architecture is its modular system. By studying typical structures and components of Chinese traditional buildings, parameters of different structures are summarized and simplified to establish the reasonable model. Then, the process of programming a 3D modelling system using 3DSMax script language is discussed. Through this method, after choosing the type of traditional buildings and entering necessary parameters, 3D model with different type and size can be created automatically and efficiently. The research of this paper could provide a new way of establishing 3D model for building’s virtual reconstruction and walkthrough.