Abstract: To achieve the protection and revitalization of cultural heritage, in line with President Xi Jinping's call for "making more cultural relics and heritage come alive and fostering a strong social atmosphere for inheriting Chinese civilization," digital twins are increasingly becoming new tools and platforms to realize this goal. Based on the construction practices of the Suzhou CIM+ Ancient City Protection and Renewal Platform, this paper reviews the practical challenges, theoretical foundations, and digital twin technology bases of Suzhou's ancient city protection and renewal. It innovatively proposes a digital twin framework for Suzhou's ancient city, using scenarios such as digital recreation, value identification, scenario simulation, and comprehensive governance as drivers. The technical drivers include a spatial coding system, distributed architecture, real-time response simulation, and flexible human-computer interaction. These innovations aim to resolve the contradictions between the protection and revitalized development of the ancient city, promoting its sustainable development. The paper also looks forward to the digital revival of traditional construction methods, the digital evolution of traditional lifestyles, and the digital enhancement of traditional cultural values in Suzhou's ancient city. Through these practices and summaries, it provides a solid methodological foundation for achieving broader, deeper, and higher-standard protection and revitalization of urban historical and cultural heritage in the future.