Establishment of Digital City has set off a boom in the world. Of which the construction of 3D building models has attracted great attentions in recent research topics. Most existing studies have focused on the visualization of 3D buildings. However, 3D building models shall not be confined to visual appearance only, but should be integrated with other information to add value for their applications.This study is built on the basis of large-scale topographic map data with LOD1-LOD2 building models, and the Result Map of Building Survey and other relevant information from the Land Department that constitute LOD3-4 3D cadastral building models. According to content and features of the 3D model data, an exchange framework that is compatible with OGC CityGML standard for 3D cadastral buildings has been designed. An open-source software platform has been developed to demonstrate the feasibility of the 3D building data exchange framework.