With the rapid development of information technology, big data and digital twin technology, the construction of smart cities has become an important issue for the integration and coordinated development of urban and rural areas. The traditional urban spatial planning method has not adapted to the rapid development of modern urban construction. Therefore, urban transformation is both an inevitable requirement and a need of the times. By combing the literature on digital twins and smart cities, it is believed that in the context of big data, urban spatial planning research methods can be provided for urban planning. A new data thinking concept and urban planning method have emerged, and urban problems under the new situation have been analyzed and solved from multiple perspectives. Therefore, taking the research of smart city planning method as the main line, enriches and supplements the framework of traditional cities from the three frameworks of smart city spatial planning background, smart city planning method and construction focus, and smart city future sustainable development strategy, which is of great significance to the construction of new urbanization and the development of digital cities.