political power; comparative study of islamic and liberal thought

political power is considered as one of the most fundamental public law vocabulary, as far as the separation of political power and public law seems impossible. meanwhile it seems that this concept as the fundamental concept of public law; varies in islamic and liberal thought and there is a serious conflict between them. analysis of this claim requires a proper understanding of the concept of political power and its components in each islamic and liberal government.  that is why this article first explores the notion of the power in its word, terms and common litreture of public law with liberal recitation and then studies position and concept of political power in religious literature based on the thoughts of imam khomeini (ra) and at the end review the concept of velayat as an original configuration and corresponding concept of political power in islamic government. finally, it seems concepts of political power and velayat or its similar islamic concept substantively have significant differences because political power rooted in transcendence and arrogance of rulers, while the velayat is an instrument for realization of divine sovereignty via rejoining people`s hearts with rulers. therefore, based on distinction between the concept and looking at the most fundamental concept of public law in these two ideas, besides the difference in probability and amount of corruption due to power of velayat, legal appropriate structures in order to adjust the range and their applied method with vary with each other.