The Islamic revolution emerged victorious under the unprecedented leadership of Imam khomeini and as a result of the iranian people’s heroic efforts in 1979. The Islamic Republic Day is undoubtedly one the most important and decisive days in the history of Islam as well as Iran. Imam Khomeini’s great act was that he created and actualized this idea of an Islamic Republic; the base for the realization of that theory was his deep knowledge of Islam and people. The great job done by the honorable Imam was that he coined the theory of Islamic Republic and put it into different political theories; then, he utilized it in real world.