Abstract:Aiming at the characteristics of high technical difficulty, limited construction period, complex hydrogeological conditions, various surrounding important infrastructures and high requirements for construction personnel management in the construction of underground interchange projects in the urban complex environment, the overall implementation route of digital construction of the project is explored. And relying on Songhu Road - Sanmen Road Lower Grade Separation Project, the scheme planning, interference checking, key technological construction simulation and multi-source data integration application are carried out based on 3D refinement model, which provide the effective construction guidance for project construction. At the same time, the data integrated management platform of wisdom site is studied and developed to realize the intelligent supervision of site and effectively enhance the construction management level of project.