The human kind is an entity with a complicated nature endowed with diverse dimentions that lead to more comprehensive studies on mankind. The most significant dimention affecting his life is the dependence on divine and ultra-natural phenomena based on which he could define and reorganize his difficulties and hardships in life so, religion became an integral parts of him and he made many decisions based on it.

How was religion prevalent in an individual's life and consequently, how it affected his social life and the role it played through society components in directing and orienting general process of life, is a duty encumbent on relision sociologist.

Iranian civilization as one of the oldest human civilizations in which belief in religion was an essential part, is the best and most rational example that can be studied and analysed by religion sociologist.

Shi'ism spread and expansion to allover the Iran gave rise to intesrity and unity of social. and to cultural harmony and homogeneity in this country.

Examining how this institution, ie. religion was present and how efficient it was in making policies and shaping Iraning evolutions or changes is what by providing historical records and documents and by examining the influence of beliefs on his performance, will be tangible. Relision elements each pleys a role in socio - political changes of Iran requiring scientific research and inquiry.

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