Hangzhou Metro 5 Phase I Project Application of BIM Technologies, Based on the experience of BIM construction in many cities, combined with the characteristics of tight construction period, heavy tasks, numerous mechanical and electrical pipelines and complex decoration nodes, we carry out specific BIM planning and BIM construction application management. We use BIM+CAM software to achieve LOD 400 product-level modeling, and use Revit+Fabrication to deepen the design of electromechanical prefabricated components; using the plug-in developed by Revit SDK to output the NC code of air ducts and pipes to achieve factory prefabrication, automatic production and modular installation; and using 3D printing technology (pre-assembly of 3D printing solid model) to verify the digitalization of BIM assembly design.