This short article aims to explain the modality of establishment and development of urbanization in the eastern parts of the Iranian plateau. The Main data and material of this study are extracted from the results of more than fifty years fieldwork in this part of country.There are at least two main cultural zones in the eastern and northeastern parts of the Iranian Plateau, within which the remains of the oldest urban centers and settlements with an extension of 10-12 hectars and a population between 2000-3000 have been found. The available data show that during the third millenium RC fertile lands, irrigation systems raw material, full time expert workers, the division of work and central organizations as parts of necessary conditions for the establishment of an urban society were present. Sistan with the Hyrmand River and the terminal lake of Hamun is one of the large cultural zones in the eastern Iranian Plateau. Sistan possesses a suitable condition for both agricultural and industrial activities. The main archaeological sites of the region are Shahr-e-Sukhta in Iran and Mundigak in Afghanistan, located near the banks of the Arghandab River. During the first half of the third millenium B.C. in both sites, the firmness and solidity of urban organization could clearly be seen in the societies settled in these cities.As in Mesopotamia, the cities in the Iranian Plateau possessed temples, palaces and large monumental buildings. More recent excavations have shown that most of the temples or public buildings in mud-bricks were built on top of platforms or the remains of older structures. Although the presence of Zigurats in the Iranian plateau is very limited, the temples found in Altyn Tepe, Turange Tepe, Mundigak and thre mud brick structures of Konar Sandal are only a few examples of such structures which are attributed to the second half of the 4th or the first half of the 3th millenium B.C.