DGN document analysis method

The invention provides a DGN (Data Generation Network) document analysis method, which comprises the following steps of: opening a DGN document by using OpenMCDF to obtain file stream data; an OLE Property format is adopted to analyze the Summary Information and the DocumentSummary Information, and the attribute information of the DGN document is obtained, and the DGN document is used for analyzing the DocumentSummary Information and the DocumentSummary Information according to the attribute information of the DGN document; performing compression judgment and decompression on the file stream data by utilizing zlib magic words; analyzing stream file structures such as Dgn-Md and the like to obtain model data and attribute data; and establishing a tree structure for the analyzed data. The method only depends on an OpenMCDF and a zlib library of an open source, and can directly run in operating systems such as windows, mac, linux and the like; operation in virtualization environments such as docker and the like