City information model (CIM) is one of the important tools for the construction of smart cities and the digital transformation of cities in China. Its core technologies mainly include IoT sensing technology, GIS and new surveying and mapping technology, digital twin modeling technology, visual rendering technology, simulation deduction technology, and interactive control technology. Taking the Unicorn Island Smart Park project as an example, this article explores the intersection and integration of CIM technology, IoT technology, big data technology, and visualization rendering technology; designs and builds application scenarios to support the entire lifecycle of industrial parks from planning, construction, management, and operation, to spatial value enhancement; forms digital operation concepts and approaches for parks, industries, markets, and society; and extracts the characteristics and highlights shown in the project to provide basic support and construction experience for promoting the construction of smart parks and smart cities in China.