The development of smart cities has greatly improved the living and working environment of urban residents, but whether it can enhance the happiness of urban residents is a controversial topic. In this study, we investigate residents' experiences of obtaining information, services and networks in smart cities from the aspects of safety, usefulness and convenience, and empirically explore their relationship with residents' subjective well-being (SWB). The results show that residents' safety, usefulness and convenience experiences of obtaining information, services and networks in smart cities all have positive impacts on their SWB, and the relationship between residents' safety experience and SWB is, to a certain extent, mediated by their usefulness and convenience experiences.