Abstract: Digital twin city represents a new model of city digital transformation driven by information technology, fostering the modernization of cities. With the continuous concentration of urban data and information resources, the integration between digital twin cities and real cities has deepened, amplifying the security challenges facing digital twin city infrastructure. This paper addresses various difficulties confronting digital twin city infrastructure, including the complex security issues of heterogeneous systems, lack of theoretical model guidance, difficulties in assessing the impact of network attacks and optimizing security management strategies, and new technology security risk response. In response, we propose a safety and security assurance architecture tailored for digital twin city infrastructure, which encompasses management, technology, exercise, and operation systems. Additionally, we discuss some key technologies and platforms aligned with this assurance architecture, aiming to provide reference for the safety and security construction of digital twin city infrastructures.

Key words: digital twin city, infrastructure security, safety and security assurance system, safety and security exercise system, safety and security technology system, safety and security operation system

摘要： 数字孪生城市是信息技术驱动下城市数字化转型的新模式，正在推动城市现代化发展.随着城市数据和信息资源的不断集中，数字孪生城市与物理城市的联系愈发紧密，数字孪生城市基础设施安全问题越加突出.针对数字孪生城市基础设施的安全架构指导不足、安全风险复杂严重、安全可视化不足、安全策略优化困难等难题，提出了由管理体系、技术体系、推演体系、运营体系组成的数字孪生城市基础设施安全保障体系，研究了实现所需的关键技术和平台，为数字孪生城市基础设施安全建设提供参考.

关键词: 数字孪生城市, 基础设施安全, 安全保障体系, 安全推演体系, 安全技术体系, 安全运营体系