Magister Artium - MA / Imāmah, (imamate) literary means leading, and khilāfah (succession) means representative. but, in the terms of "Islamic concept", the medieval theologian and jurists has termed it «Religious–Political leadership».1 the major dispute concerning the imamate surrounding the question of investiture to exercise the prophet’s comprehensive authority (Wilāyah‘āmah), as the temporal and spiritual leader of the ummah (community). From demising of the prophet, the matter of imamate, between Ash‛arī and Shī‘ah (twelve) there are two main opinions. Ash‛arī’s views are prevalent among the early Muslims headed by Abûbakar and his associates regarded the imamate to be right of the ummah (nation), and they chose Abûbakar. The Shī‘ah implicitly rejected the previous opinion, and maintained that the leadership was passed on through a special designation. This regarded the imamate divinely invested in ‘Ali ibn Abī Ţālib, the prophet cousin and son-in-law. Therefore, controversy between Ash‛arī and Shī‘ah on the question of leadership arise after the prophet returns and coherences to the two fundamentals central points: First: The nature of the relationship of the prophethood to the political leadership. The Shī‘ah regarded political leadership as an extension of the prophetic mission after the demise of the prophet: «Meaning that political leadership is not simply political rule but it is the corollary of the interpretation of religion, and takes imamate in depth interpretation»2. Other hands, Ash‛arī consider and include it in the matter of masāliħ Al ‛āmah (public interest). The Islamic jurists definite the masāliħ al ‛āmah (public interest), any issue whether it is religion or matter of world that could not fixed with fact proof from holy Qur'ān and prophet’s tradition. Therefore, the matter of caliphate emerges it in the masāliħ al-‛āmah (public interest) which, relies on human agency. Second: The contract of political leadership and authority between the problematic of mutual consultation and divine appointment. This point focus on ‘aqd (contract) of khilāfah (repress- entative of God) between leader and ummah (nation) and evolves around the problem of consultation, mainly in the Ash‛arī’s view, which is based on "selection system". So, in the historical experience, it can be noted that the consultation as mechanism in the choosing the ruler was not achieved as an "organized system" neither in the period of the rightly guided caliphs, nor in the periods of dynastic rulers. The imamate as a «supreme leadership» had a major problem issue in the contemporary scholars, both the Islamic and secular, since it was announced in the modern context Dawlah (government), which based on nationality and separated from religious hegemony. Its dialectic, in the present article, is to deal with theological and judicial theory. Therefore, in 1979, the Islamic council of Europe published a «concept of Islamic state». Most of the figures shaded are based on the Khomeini's thought (the founder of Islamic republic revolution of Iran), and Karāchī’s Muslim council scholar (they constituted Ash‛arī view). In the Islamic state, the Khomeini thought based on «the Islamic state is constitutional; Government is based on law and the Paramount legislative authority resides on God himself». On the other hand,«the Islamic state» shaped as «the principals of an Islamic state which centers on the supremacy of God, citizens rights and proper government» 3 Therefore, caliphate it is difficult to separate or detach from prophethood in the perspective of the commentary and interpretation of equally the Qur'anic and Sunna texts. So, difference between Ash‛arī and Shī‘ah around immāmah (leadership in Islam) are based on the theological principles which rise from the problem of cosmology, divine justice and human destiny. Therefore, the difference can be based on the idea (thought) about these theological principles.