Sasani oppression over Iranians made grounds for their collapse such that when new_muslim Arabs attacked, Sasani tribes didn't tolerate any more and lost their political lives soon. But the rise of Islam within the provinces of Iran, despite the starting delight, accompanied with Omavi caliphes unbelievable rigours: according to historical resources, after Imam Ali's martyrdom in year 41AH, as the caliphate structures infected with the inane and strict foundations of throne, the rulers of different parts in Iran hadn't had any objective except personal benefits. The performance of Omavi caliphate governors in many countries like Iran, led to the insecurity, tyranny, cruelty and oppression in the history of this territory. The present research offers a documentary approach within historical documents using a descriptive _analytical method. The research results indicated that: Omavi rulers who were involved in a racism spirit, in an increasingly vast process just brought about the deprivation of social _human rights and as a result their collapse. These were unblessed preparations to sacrifice justice for injustice and delight for darkness.