This paper aims to promote the application of BIM technology in the research and protection of traditional Guangxi Zhuang and Dong ethnic architecture and handle the parametric modeling of such capital components of building column through common methods. In the paper, a modeling script based on Dynamo was developed by adding some third party nodes and a small few of parameters, thereafter a preliminary parametric modeling method of such components was constructed. Through verifying the modeling of common capital components, the proposed method in the paper functions well, which provides a new idea for BIM modeling of other building decorative components.