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Today, the population of cities along with their socio-economic issues has created a new form of city and urbanization. Tehran province has seen the most changes in the city and urbanization due to the establishment of the capital, the metropolis of Tehran. The question is what are the consequences of urban demographic changes in Tehran province? Therefore, this study tries to investigate the consequences of demographic changes in Tehran province on its urban network during the years 1355-1395. The research method is descriptive and analytical and its type is inferential. The data were extracted by library method and analyzed using regional planning models such as city rank-size and prime city index, entropy and prime city coefficient, Lorenz curve and Gini coefficient. The results show that the increase in urban population in Tehran province is due to the dispersal of the metropolis of Tehran and the concentration of urban population in the western part of the province is higher than other aspects of communication. Although medium-sized cities have partially repaired the spatial rupture in the province's urban network, according to the rank-size model, the distance between the metropolis of Tehran and other cities in the province is still very large and there is no balance in the province's urban network. Meanwhile, the urban population is not uniformly but in a cluster around the metropolis of Tehran and in the next order of medium-sized cities.