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Based on the modified gravity model and social network analysis method, the paper constructed the economic linkage intensity matrix of 34 prefecture-level cities of Northeast China and analyzed the density and structure of urban linkage networks. The results show that at present, the urban linkage network in the Northeast region is getting closer, and the radiation role of core cities is gradually increasing. However, the degree of regional integration in Northeast China is not high, and some remote cities are still semi-isolated from the network.