This article argues that Constitutionalism Movement is result of reformism in Ghajar Era. The conquer of Constitutionalism, have been result of Iran's political – social and economic condition (circumstances) and victory of reformist actives. This survey by Considering of specifics of this movement, have been insisted on movement leaders, understanding and awareness from cultural and social modernization. In this regard constitutionalists were followers of previous reformists, who began their activites at least from rise of Ghajar government. Therefore Constitionalism Movement was continuance of Iranian reformism history.