Abstract: With the in-depth application of surveying and mapping geographic information technology and BIM technology in urban development,the construction of urban underground pipe network BIM has become a necessary link in the construction of smart city and three-dimensional real scene in China.Combined with the application of new basic surveying and mapping in underground space surveying and mapping,this paper puts forward the deep integration technology of underground pipe network surveying and mapping data and BIM,quickly constructs the technical process and system of urban underground pipe network BIM,constructs the refined BIM model under the urban level (GIS) scene,realizes the seamless integration of surveying and mapping data and design data,and opens up the integration channel with surveying and mapping data in multi-disciplinary cooperation,Provide accurate three-dimensional spatial data base for invisible underground city construction.Based on the research results of this paper,taking a city as an application case,its data have been deeply applied in the fields of urban drainage network reconstruction project,smart water cloud platform construction,smart pipe gallery construction management and so on,which verifies the feasibility,effectiveness and application value of this research.

Key words: urban level, underground pipe, BIM, application