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.