A doctorate thesis proposal about the basis of constitutional justice in Kant and Rawls demands one investigation of the basilar premises and concepts of the theories of the philosophies of Kant and Rawls and its contribution to justice in constitutional level. This research intend to comprehend the main moral and philosophical concepts of these philosophers in the way of their universalistic and procedural theories in the contemporary constitutional context. We try to focus on the necessity of the constitutional theory discuss, as the new proposal of the neoconstitutionalism, the moral theories as a social and political values. The hypothesis is based on the theoretical demonstration that justice has its foundation in categorical values, morally accepted by the social agents, and assure the possibility of a constitutional state, in fair terms of social cooperation and moral values.