As the important model basis of smart city and digital twin city, CIM is becoming increasingly important in the context of "New Infrastructure Construction". Based on the domestic and foreign research literature, this study summarizes the development process of CIM, elaborates the main research directions and technical implementation platforms of CIM, and introduces its typical applications, which provides an important reference for the research of CIM.

With the development of urban construction, the increase of project scale has brought about the problem of increasing management difficulty. By integrating the Revit, ArcGIS, CityGML, database and Web technology, this paper integrates BIM and GIS data to form City Geography Markup Language (CityGML) data, completes the database design of Engineering multi-source data, designs and develops an intelligent management system for urban engineering projects based on BIM and GIS.The system realizes project schedule management, quality management, engineering measurement and safety management.It can greatly simplify the management process, effectively improve the efficiency and quality of management, and save the cost of management.It can effectively solve the problems of poor information communication, time-consuming and inefficiency in the use of traditional management methods in engineering projects.