Digital infrastructure, the essence of new infrastructure, accelerates the interconnection of everything which means the arrival of the digital twins era. In the era of digital twins, network security will not only affect the virtual space, but also extend to the real world, causing serious influences on national security, social security, and personal safety. Therefore, as the most important cornerstone of new infrastructure, network security has become increasingly urgent. It is necessary to build a protection system for new infrastructure network security as soon as possible to ensure smoothly promoting the new infrastructure strategy and keep digital economy sound and prosperous. In the era of digital twins, the number of cyber attacks on critical infrastructure will inevitably increase. In the past, the limitations of the traditional security system featuring temporary solution have further highlighted. To face future security challenges, it is necessary to abandon fragmentation and single-point defense so as to build a continuously evolving security capability system.
