With the deepening of economic globalization, interregional connectivity is increasing, making regional economic linkages a hot topic in economics. This study draws on the principles of operations research to classify the urban spatial financial interaction structure into four primary forms: isolated scatter, line, circle, column and network. Through the social network analysis method, the economic structure of urban space is analyzed from the three dimensions of network density, network centrality and cohesive subgroups. At the same time, the distribution of the potential hierarchy of intercity economic links is explored in detail using the gravity model. The empirical Analysis of the 26 city clusters in the Yangtze River Delta reveals that the spatial correlation of the industrial circulation level among these cities is 0.331, and the mean value of the empirical distribution reaches 0.4338, which significantly indicates that the industrial circulation level is positively correlated with the regional economic development. This study provides a valuable reference for the formulation of regional development strategies and shows a unique innovation in enriching the content of economic linkage theory.