The indoor renovation starts with the horizontal spatial integration and vertical spatial expansion and the design reorganizes the horizontal cross-shaped public transportation space, and also divides the area between open office and independent office; different color shade is used in the floor to distinguish the different functions. The design makes full use of the advantages of floor height to implant intermediate spaces and the original structural system is concealed at the same time.The architectural design method is concise and comprehensive, providing users with various spatial pattern.