Based on the underpass construction by traversing the common ditch of Bocheng Road in Shanghai Expo, this article applies BIM technology in the decision-making, design and construction processes, which guarantees both the green construction of the Expo and the operation conditions for the pipelines within the common ditch. Besides, the project closes the envelop structure of the common ditch, which guarantees the safety of pit excavation, stability of the common ditch and the construction of the underpass. The application of BIM technology in this project shows that through the whole-process BIM virtual construction, the plan is optimized, the cost is reduced and the schedule is shortened.