Abstract: In order to improve the urban comprehensive service function and security level, and achieve a virtuous circle of urban human settlements, for the spatio-temporal continuing urban safety space including the public space with functions of urban operation and disaster prevention and the exclusive space of social unit in the daily life, an architecture theory of urban safety space was advanced, in which the emergency, the object of disaster, and contingency management were involved. A construction technology of urban safety space including urban public space comprehensive prevention and control system and social exclusive space security system, through the monitoring system by internet of things, risk evaluation and precision management, and the innovation of public safety management and service model was also developed and applied to Hefei city. The results show that the theory advanced and the technology developed by the authors integrate the functions of safety operation perception, dynamic risk monitoring and early warning, decision-making and command, and unified scheduling and effectiveness evaluation for urban public space, and can be used to achieve the ability of independent security and defense for social exclusive space and to promote the transformation of urban safety mode from the passive response to the active guidance.

Key words: urban safety space, public safety, internet of things, big data, urban comprehensive risk