In the second phase foundation pit engineering of National Convention Center, BIM technology is used in the whole process of design and construction to solve the problems of deep foundation pit, complex surrounding environment, tight construction period, multiple support forms and strict safety requirements. In the design stage, using the theory of forward design of BIM technology, combined with the characteristics of three-dimensional visualization and fully considered the deformation control requirements of surrounding buildings, structures, pipelines, subway, circular tunnel and sinking road, theunderground and above environment refined model was established and the design scheme was optimized. During the construction process, BIM technology is used to simulate the construction scheme and process. At the same time, the information of materials, machinery, safety monitoring and other aspects are integrated into the model, and the corresponding management platform is used to control the quality, safety and progress to improve the refined management level of the project. BIM technology is used to break the gap between the traditional design, construction and monitoring of foundation pit engineering, and provides the corresponding data model for the general contractor and the owner, so that all parties can communicate efficiently and facilitate subsequent project construction and operation and maintenance.