The research used spatial analysis and space syntax to analyze the distribution characteristics of urban development intensity, integration, and urban vitality and the linkage effect among them, and explored new ways to study the spatial differentiation of urban clusters in Shishi City, Fujian Province. The results show that:① The development intensity of the central city of Shishi is characterized by “circle+axis” distribution, with high development intensity along the business land with clear axes. And the spatial distribution of the “medium-high-middle-low” circle of integration and urban vitality is clear and uneven, and a business ring with urban vitality is formed along the business land and mixed business and residential land. ② The location conditions and land use functions of urban land are the determinants of the linkage effect among urban development intensity, integration, and urban vitality, and the analysis of the inner mechanism of the linkage effect among the three can precisely classify the study area into 9 clusters of spatial differentiation types. The application of this linkage effect can guide the regulation of urban spatial structure and the ecological management of urban problems.
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