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This article makes an attempt to answer a question, which has been treated in a few of the existing works on the Iranian Revolution related literature only very superficially. That question being "why did shi'ism as an ideology in the process of mobilization leading to a revolution in Iran, recieve public admission, and in a techincal sense, become hegemonic?" Although an answer to the above question lies, on the one hand in the developments and the internal potentiality of the shiite Islam, and on the other, in the actual conditions of the society, the author emphasizes the hypothesis that credibility, legitimacy and availability of the shiite Islam plus the fact that admitting it did not require to be converted to a new cult, were among the most significant reasons for it's being
hegemonic.