Abstract: The construction of city information model (CIM) platform is one of the important starting points to explore the modernization and digital transformation of urban governance in China, and its development path focuses on the integration and interaction of information technology such as building information model (BIM), geographic information system (GIS) and Internet of Things (IoT). Taking the construction of Xiong'an Planning and Construction (BIM) Management Platform and Suzhou CIM Platform as examples, this paper discusses how the CIM focuses on the planning, construction, management and operation of the whole life cycle of the city and the multiplier effect of urban spatial value based on the integration of BIM, GIS and IoT, and attempts to identify the governance focus of BIM and multi-source spatial data in different environments of new and built-up areas, and emphasizes a more open human-computer interaction mode.