Abstract: he “Neighborhood Library” project initiated by Foshan Library transforms the typical private space of family into a public space providing reading service, which is a distinctive innovation in the construction of public cultural service system. Through an elaborative description of the “Neighborhood Library” project, this paper explores the formation and operation mechanism of this family supply network of public cultural services. It is found that in the process of formation, the initiation of network depends on the institutional innovation, structural change, and resource acquisition of the leading agency. Motivations of family education, personal hobby, social responsibility, career development and legitimacy, as well as the trust based on institution, experience and interpersonal relationship, affect the intention of citizens to participate in the service network. Also, participants can help expand the service network through daily management and publicity. In the process of operation, commitment, communication, collaboration and evaluation are the keys to guarantee the quality of service, whereas factors such as resource sharing, environmental support and goal realization determine the sustainability of networks.