In recent years, China's construction industry set off a boom based on information revolution, in which "BIM technology" has played the most important role. It can not only realize visualization applications such as collision check and virtual construction projects but also related information database applications such as economic contract planning, short cycle multi-count contrast. However, exaggerated propaganda, unrealistic thoughts and unacclimatized software makes the "BIM technology" more and more mysterious and distant from the truth. But as a revolutionary technology of the construction industry, the achievements of "BIM technology" can never be neglected. It can optimize traditional working modes, improve working efficiency, carry out fine reformation of the extensive production mode, and realize BIM-based integration workflow of "design-contract-construction" (DCC-BIM). According to requirements of each stage of the integration workflow, BIM reconstructs elements based on certain standards and codes, and thus BIM application body plays a substantive value at a certain stage. Similarly, the combination of BIM technology with technologies such internet, cloud computing, point cloud, radio frequency and 3D printing would certainly play an invaluable role in the future smart city construction.