Huashu proposes a security solution of "one city, one key" through the zero trust dynamic security management and control system: replace the traditional mechanical lock with a non porous passive dynamic intelligent lock, solve the key management, improve the intrinsic safety of the municipal administration, and achieve full control of the operation process: take the intelligent lock as the terminal data carrier, take the task as the guidance, and adopt the management rules of dynamic authorization and logical operation, Realize the "Internet of Things One Web" for the safe grid scientific decision-making management of key areas, key periods and key contents such as infrastructure, personnel operation and maintenance, environmental monitoring, etc., to avoid on-site unauthorized operations and cross-border operations, and avoid casualties caused by unsafe behaviors of people.