The fabrication and assembly of the components of the long-span steel truss bridge is complicated, and it takes a lot of manpower, financial cost and time to adopt the on-site prefabrication. Therefore, in this paper the authors conduct a feasibility study of construction scheme simulation based on BIM technology and a component processing quality detection study based on BIM technology and 3D laser scanning method. Except for the work above, the authors further study on the virtual assembly technology integrating BIM technology with 3D laser scanning method and the feasibility of guiding the implementation of the intelligent construction technology application of long-span steel truss bridge.