As a national new industrialization demonstration industrial base, a strategic emerging industry demonstration zone, and an important bearing area of the Shanghai Science and Technology Innovation Center, the LinGang area aims at cutting-edge concepts, advanced technology, and demonstration leadership, relying on digital cities, big data, artificial intelligence and other new technology, finding scientific support for urban management. In response to the construction needs of smart Lingang area, this article proposes a BIM+GIS-based urban big data basic data platform architecture, collects and manages urban data, realizes an urban operation big data platform based on time-space calibration and data fusion, and completes the urban foundation data collection and digital construction provide a carrier for various city-level application data, thereby realizing dynamic management and decision-making support at the entire city scale.