Changes in Tehran metropolitan Peri-Urbanisation lead to extensive changes in the socio-economic structures of the area called metropolitan fringe. One of these effects is 11,000-percent increase in the population of Tehran conurbation over the past 60 years,creation of numerous population centers on the capital. Along with the counter urbanization of Tehran,national measures have been taken to decentralize this city,balance the urban system,whose success rate has so far not been seriously evaluated. The present study,focusing on this gap,seeks to examine the effect of the expansion of Peri-Urbanisation around the Tehran metropolis on the urban system of the country during the period from 1335 to 1395,in order to analyze the success of national decentralization policies as far as possible. The type of research is applied-development,the method used is of descriptive-analytical type. The area under study is the 6th urban area of Tehran,Mashhad,Tabriz,Isfahan,Qazvin,Shiraz,which includes 116 cities,according to the latest census in 1395,it has a population of 24567327 people. The result shows that in the study period,the concentration of Tehran in comparison with other urban areas of the country has been constantly decreasing,but because of the decentralized concentration of the city,the development of the urban fringe around it,the concentration of Tehran conurbation in relation to five other urban conurbations during the last 30 years have been almost constant,and national decentralization policies have not resulted in a spatial balance in the city’s network.
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