عنوان مقاله [English]
Introduction: The main purpose of this research is review and analysis of spatial equilibrium degree in East Azerbaijan urban system based on entropy index and class difference limit model underlying of statistics and information of 6 periods of census.
Method: Method of research performance is the form of quantity-analytical parallel with presenting of practical models. Mentioned statistical society in this research is the cities of case study province that formally enunciate as a city in census.
Results: In 1385 reducing of share of Tabriz population has reached to 58.19 percent. Also share of province great cities population have faced with reduction but because of number of province cities have reached from 39 cities to 57 cities and also the number of small cities and low population have raised more. Therefore because of rising number of small cities the reduction of Tabriz population share comparison with whole of province population renews exaggerate and entropy degree has reduced to .502.
Conclusion: The conclusions of this research reveal that settling of population in centers and city classes have distributed with equilibrium form and concentration process of Tabriz metropolis is streaming with noted speed and have directed city network from semi equilibrium situation to crisis conduction.