The purpose of this article is to evaluate urban population distribution and number of cities distribution at the urban levels in one zone. By using this model, we can understand space balance rate of population settlement, and the number of cities at the urban system level, state, zone and country. By using entropy, coefficient model has been tried to understand the balance rate of population settlement and cities number at the urban, district, township system levels of Lorestan. So, dwellings and population general censuses’ results of 1986, 1996 and 2006 have been used to define changes and alterations of state dealing with space structure for the past 30 years. This study shows that there is unbalance trend to urban movement levels at space structure. There is less unbalance movement at township levels compared to the urban levels. States trend to the space organization balance at the national level.
Key words: Space organization (structure), entropy model, population distribution, lorestan State, Iran.
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