With the transformation of the construction industry to intelligence and informatization, BIM has become an important method in the industry. Three-dimensional design through BIM technology can be used as a way to develop the informatization of assembled buildings while a single Revit software is not able to meet all the design functions of assembled buildings at this stage. However, as one of the most commonly used software in the field of BIM, Revit has rich development interfaces to export a variety of file formats and realize the effect of a model implementing the whole project through secondary development. In this paper, C# language is adopted to carry out secondary development of Revit through VisualStudio platform to create assembly prefabricated components library and parametric modeling plug-in to accomplish rapid drawing and standardized modeling of prefabricated components, e.g. columns, beams, slabs, shear walls, stairs, etc. Moreover, parametric modeling is realized through plug-ins on the basis of model establishment, therefore repetitive work can be replaced by automation technology to improve the efficiency of modeling.