The paper firstly studies the problems with the development of building collaborative design and points out that the application of building collaborative design shall move from 2D to 3D step by step. Then the key technologies regarding to the building collaborative design platform which is suitable for large-scale architectural design institutes are introduced. The application of building collaborative design is described in detail with a practical engineering project by Shanghai Xian Dai Architectural Design Group. The characteristics on CAD standards, collaboration, high efficient communication, and advantages for large projects are discussed by the architects who have worked on the building collaborative design platform. Finally, the building collaborative design methods are summarized together with the problems to be improved and further development of building collaborative design platform.