The CIM twin basic platform of CSCEC Electronic Information Technology Co., Ltd. reconstructs the three-dimensional model of cities through the digital twin technology. The digital twin CIM platform maps the roads, buildings, waters, vegetation, facilities and other objects of the physical city in the digital twin city, restoring every detail of the city while realizing the reprocessing and innovation of urban construction, operation, management and service. Through the integration with the perception data of IoT, the platform can fully perceive, interconnect and analyze cities with full response and application, so as to achieve efficient allocation of public resources and proper handling of urban events, with increasingly delicacy and smart urban governance.