Abstract: In view of the problem that the CAD (computer aided design) format data is hard to be reprocessed or analyzed during metro construction, by using the FME (feature manipulation engine) data conversion idea, the Shapefile format data is taken as an intermediate format for the conversion of CAD format data to commercial GIS (geographic information system) data that can be visually displayed on the map. At the same time, combined with the data rendering and spatial analysis technology in the GIS field, the fusion processing of CAD format data and GIS map is realized. Finally, a set of inspection management system is developed, with functions including real-time operation trajectory recording of inspection personnel, display of the relative position of the projects under construction and the outer contour of metro protection area, the closest distance measurement, and the superimposed display of the scope of metro protection area in 3D city realistic model.