Abstract: To solve the problems of large linear metro engineering involving numerous types of documents and data, complicated versions, and difficult application of BIM (building information model) and GIS (geographic information system) data.Based on GIS platform, by means of spatial registration and fusion, cartographic synthesis, online creation of geographic services, an engineering thematic map platform of bidirectional interaction between BIM and GIS——File Code Map, is explored. This platform integrates the spatio-temporal attributes and engineering attributes of large linear metro engineering, and is easy to use interactively. It can provide a comprehensive management perspective of macro and micro combined for the large-scale linear traffic engineering projects, improving the query and management efficiency of engineering documents and models. It has the potential for further application in document management, construction plan management and progress management.