[Synergistic Effect of Building Carbon Emission in Urban Agglomeration]

Against the backdrop of continuous growth in urban building carbon emissions， it is crucial to utilize inter-city network relationships to achieve synergistic emission reduction. Based on the improved gravity model and social network analysis， the structural characteristics of the spatial network of building carbon emissions in the Yangtze River Delta city （YRD） agglomeration and its synergistic effect were explored. The results showed that the network had a "core-edge" structure， with an increasing number of network relationships and network synergy. Shanghai， Suzhou， and Wuxi were in the leading position of the network； Nantong and Maanshan were the cities with the highest closeness centrality； whereas， Nanjing had the richest connectivity. The YRD city cluster was divided into four plates， and the net beneficiary plate included economically developed cities， concentrated in the coastal region. The net spillover plate was rich in city resources， and the broker plate was responsible for information transfer between cities. The bidirectional spillover plate accelerated the flow of network relationships. The results of the study helps clarify the synergistic role positioning of the cities and provide a reference for the development of synergistic emission reduction strategies for city clusters.