In order to realize the intelligent construction and safe and efficient management of Yueqing Bay seacrossing Bridge, a refined three-dimensional model of the whole bridge is established based on BIM technology. On the basis of BIM model, the paper carries out BIM technology applications such as construction simulation, drawing review, engineering quantity statistics, three-digit scheme deduction, automatic assembly line information collection of prefabricated components and collaborative management combined with cloud technologyt. The BIM technology has been upgraded in such research fields as BIM automatic modeling, steel bar automatic blanking, BIM information platform and database data system. The application of BIM technology in the construction of a sea-crossing bridge project accomplishes the information and visual management of bridge engineering projects, which effectively improves the quality and efficiency of construction, shortens the project cycle and cost, and accumulates experience for the application of the technology in seacrossing bridge project.