The Framework and Practices of Digital Twin City

Digital twin city has become an important choice and trend of urban digital transformation. Based on the theory of digital twin this paper proposed “4+5” digital twin city framework and applied it to the study of digital twin cases in China, the United States, France and other countries, analyzed the challenges being faced. Suggestions and guidance on the development of digital twin city were given to city builders and suppliers, as well as governments for strategic planning.