Investigation and analyzing Urban Networkof Lorestan province

Macrocephaly phenomenon has been shown in lessdeveloped countries and the size of largest city in this countries is morethan 5 to 10 equal of size of population of second city . Aggregationadministrative – politic activities and commercial – social activities infirst city are deterrent of development in other cities in this countries.As a result, regional and national balance is destroyed. The purpose ofstudy is analysis of urban network in the metropolitan region ofLorestan.

the methods of this study are combination ofquantitative - analytical methods and we have used The Rank- SizeRule, Rank - size adjusted, Entropy Index, Lorenz Curve, and GiniCoefficient.

The results of this study show that urban network in themetropolitan region of Lorestan do not follow from Rank- Size Rule.The spatial balance is relatively good between population and numberof towns in metropolitan area. The distribution of urban population andurban area are semi – balanced. And finally at the macro level, first city(Khoram abad) have occurred macrocephaly phenomenon inmetropolitan region of Lorestan.

for preventing the formation of the first urban area we shouldavoid migration inter-provincial and, will strengthen the middle andsmall cities.