With the increasing demand of building metro construction, couple with its complexity, there is a great need on an integrated system to provide all the stakeholders a convenience way to exchange information effectively and efficiently. An integrated system based on 6D is proposed by this article. The core technology of the system including BIM theory and methods of associating 3D graphics models with progress, investment and safety information are discussed. By using the integrated system, it helps the project decision makers in planning, coordination and control of management to improve project management efficiency. Also, a case study is provided which is used in Wuhan metro construction and achieves good results.