With the rapid economic development after China's reform and opening up, China has made great achievements in bridge construction, for instance, bridge construction technology, bridge structure, high-performance materials, information technology, standards and specifications, etc., which also indicates that bridge construction is moving forward in China. The continuous system bridge has the advantages of small mid-span bending moment and good seismic and torsional performance. Based on the Revit API technology, this paper applies the Visual Studio 2019 platform for secondary development through using the C# language. The geometric structure and physical information are obtained from the BIM model through interface development, and meshing is performed based on the Revit model to convert the BIM model into a finite element analysis model, by which the operation threshold of the pre-processing of finite element analysis is greatly reduced. Finally, the applicability and accuracy of parametric modeling and model conversion interface are verified by the engineering example of continuous rigid-frame bridge.