In order to solve the design and construction problems of long span half-through arch bridge, the application and research of digital technology based on Dassault 3DExperience platform was carried out, including the exploratory application and research of the forward design, the collaborative analysis of complex steel local structure, the steel structure developing design and the developing application of construction, and project collaborative management. Taking the Yongding River Bridge as a verification case, the practice shows that the project based on the unified model framework organization mode is helpful to the integrated application of digital model design and construction, which improves the overall collaboration efficiency of the model by more than 20 % and effectively reduces the cost of comprehensive application.