With country's digital transformation, the social and economic collaborative development of cities within urban agglomerations will be further promoted. It is necessary to build cross-city and over all dimensional social governance system. Since the existing social governance system is based on integration of departments and regions at different levels, different information systems cannot exchange information at any level. It is necessary to construct smart city of urban agglomerations through overall architecture design. The "One Network Management" in Shanghai is based on smart city at the municipal, district (county) and town levels. The "One Network Management" uses the three-level platform to achieve data sharing and business linkage within the domain. On the experience of "One Network Management" in Shanghai, a three-level platform for urban agglomerations is constructed, as data sharing and business linkage between cities are achieved through the municipal-level platform to realize the social governance system of urban agglomerations. After analyzing the technical difficulties of cross-city "One Network Management", the overall architecture and network topology of the "One Network Management" of urban agglomerations are introduced. Through overall architecture design, the key and difficult technical contents of "One Network Management" of urban agglomerations are introduced, including edge-cloud collaboration technology, data analysis and processing technology, detection and analysis of urban dynamic characteristics, digital twins, network sharing technology, security protection technology, maturity evaluation indicators, etc. Based on these, various problems and challenges existing in current research on smart city of urban agglomerations are discussed, and the future development direction of this field is also explored.
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