Abstract: ［Objective］ Urban rail transit projects generate massive amounts of data throughout their lifecycle, including survey, design, construction, and operation-maintenance phases. These data are characterized by large volume and multi-source heterogeneity, necessitating the development of data fusion and management solutions in rail transit projects through research on the integration of BIM (building information modeling) and GIS (geographic information system) data. ［Method］ Based on the Shenzhen Metro project, an application analysis of this technical approach is conducted. By organizing the types of data generated during the digitalization process of urban rail transit, the structural characteristics of different data are analyzed. The Super Map GIS platform, combined with secondary development technologies, is utilized to automate the processing of BIM data. Then, BIM and GIS data fusion is accomplished from three aspects: data formats, coordinate systems, and rendering performance. ［Result & Conclusion］ The technology is applied to full-scale rail transit digital construction of Shenzhen Metro, resulting in the development of a BIM+GIS visual data platform. This platform offers a comprehensive solution for data integration and management in Shenzhen Metro engineering projects.