In the year of thirty Hejri, the Arab Muslims came in Sistan which was one of the important and saint centers for Zoroastrains and after different fights dominated on it. In this research, by descriptive- analytic method and based on library resources, it is tried to examine the reasons of the quarrel and the adaptation of Zoroastrains of Sistan with the religion of Islam and Muslims. They fought the invaders to protect their religious and political independence, but they adapted after resistance without any result. The lack of political unity, the reaction of Zoroaster and it’s leaders and the attraction of Islam provided the necessary background for adaptation. The result of adaptation was that most of them were attracted by Islam and the rest, by paying tax and keeping their religion, had peaceful life with Muslims.

Holy Quran

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