The paper based on enterprise big data resources,combined with spatial external economic theory and"center-periphery"theory,analyzed the spatial distribution and collaborative agglomeration level of of the two major industries within the Nanjing metropolitan area.The study finds that:(1)The manufacturing and produc-tive service industries follow the spatial distribution characteristics of"one pole,two districts,multiple clusters+multiple points".The concentration level of the productive service industry is higher than that of the manufac-turing industry.(2)The manufacturing industry is expanding outward,with Nanjing as the center,while the productive service industry is gathering in various cities'urban centers.(3)The level of collaborative agglomera-tion in the central urban area of the Nanjing metropolitan area is lower than that in the peripheral county areas.
Nanjing metropolitan areacollaborative agglomerationproductive service industrymanufacturing