With the continuous development of social informatization, the BIM technology is becoming increasingly mature in the construction industry, with its value obvious to all. Compared with that in the housing construction projects, the application of BIM technology in the foundation pit construction projects is relatively weaker in depth, and faces more difficulties in popularization. This paper takes the foundation pit construction project of the National Conference Center II as an example, to explore the BIM application in the informatized foundation pit engineering from different aspects of scheme design, model establishment, coordination and optimization, construction simulation, engineering calculation, and etc. Through overviewing the BIM application in this project, this paper summarizes the advantages of BIM application in the geotechnical specialty, which lays solid foundation for the popularizing the BIM application in the foundation pit projects.