The paper aims to reduce the loss of information when the BIM model is converted into the finite element analysis model. Taking the supporting structure of the bailey structure as the research object, the paper carries out the secondary development of the Revit modeling software and the SAP2000 finite element analysis software based on the visual studio platform. Moreover, the paper extracts the BIM model information in the actual project and calls the function of the software through the program interface for modeling. Combined with the modeling characteristics of the fabricated structure, this paper defines and assembles different component elements in the finite element software, builds the information elements that cannot be transmitted into the components in advance, and then loads the extracted BIM model parameters into the assembly algorithm as control variables, which realizes the connection between the finite element model and the BIM engineering model and completes the transformation of the bailey structure from the BIM model to the analysis model, This method proposed in the paper can avoid the repetitive modeling work and realize the parametric modeling of the fabricated structure. What's more, it can also modify the parameters according to the actual engineering model to achieve fast creating the model and expand the application value of BIM model data.