According to the theory of urban agglomeration, the strength of the relationship between cities is an important factor in determining whether cities can be connected and integrated. Based on this, this paper uses the 2017 data as the background, based on the comprehensive use of urban functional strength model, revised spatial gravity model and urban flow model, empirical research on the spatial connection within the Beijing-Tianjin-Hebei urban agglomeration, the results show that: Beijing The “empty suction” effect in Tianjin is serious, and the resource elements are concentrated in the two cities, occupying the absolute core position of the urban agglomeration; the Beijing and Tianjin cities have the largest spatial gravitational effect, far exceeding the rest of the group, indicating that the economic base and spatial distance are restricting the urban The key elements of close contact; the overall export-oriented service industry of Beijing-Tianjin-Hebei urban agglomeration develops well, but mainly relies on traditional service industry, and the development of high-end service industry is weak; the secondary cities are relatively lacking, and the entire Beijing-Tianjin-Hebei urban agglomeration has not yet formed a good ladder. structure. Finally, based on the research results, the corresponding recommendations are made.