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In this paper fifteen selectioin indicies (five natural and ten socio - econon'lic indicies) and "Component Index Model of Development" have been used to evaluate the levels of development in the n'wcro regions of Iran. Fronl the natural,
socio - econonlic, and component indicies point of view, the regions of Iran are not homogeneous and there are imbalances among thent The rate of natural, socia - economic and component development gap in Iran regions is: 1/7, 25/6 and 5/6 respectively.
In Iran there is no high-level natural development region. The only region with natural mediuml developnwnt is the south western area and the only region with high-Ievel of socia economic development is the central area of Iran. The most
clitical region from the three mentioned indicies groups is the west of Iran.
The important problem is the lack of relatioinship between natural and socia - economic development in the regions (r = -0.0076).
The spatial pattern of regional development in Iran can be explained by "Core - Prephery)! Them)"', The regions with low
level development are mainly in the prephery, east and west of
the country that suffer from the socio - economic desolation and the lack of strong relation with the center of Iran. Optimized allocation of resources taking the decentralization policy, and annihilation inequility regions according to undevelopment degree are necessary.