Urban infrastructure is the "core" of urban development and the hardware support to stimulate the gathering of talents. Whether a city has good infrastructure may affect talents' rational choice of the city under the drive of utility maximization, and the optimization of urban infrastructure has become talents' high-level demands for life, work and social interaction.Therefore, residents' sense of security towards urban public infrastructure and its influencing factors are one of the important indicators of urban governance. Based on "public security database" and "yearbook of Chinese cities” as data sources, this study analyzed the l the government urban maintenance and construction investment and the relationship between urban infrastructure security, the result shows: the urban maintenance and construction inputs significantly positive influence on urban infrastructure, security, and residents of trust to the government has partial mediating role between the two. Based on this conclusion, this paper puts forward some suggestions for optimizing China's urban infrastructure construction and urban governance against the background of China's new cities, such as improving the emergency response mechanism in public places and enhancing government credibility. To renew the management concept of urban public facilities and realize multi-governance; Innovation of public facilities safety education model, improve residents' public safety ability.

Urban infrastructure; A sense of security; Investment in urban maintenance and construction; Residents; Intermediary role