John Rawls is affected by Kant's ethical philosophy and the representation of Kant's ethical philosophy can be seen in his works. In this paper, in order to reveal the legacy of Kant for Rawls political theory, three subjects are surveyed: humanism, ethical alternative and constructivism. In humanism, the ideas of Kant and Rawls stress on the human. Kant considered the human as a goal not as an instrument. This issue in the thought of the two can provide an ethical alternative against teleological morality is described deontological morality. Kant and Rawls tried to establish suitable relation between the concept of the free and equal individual and the concept of justice, as they create their own constructivism. In this article, we have tried to explain political philosophy and ideas of Kantian Ethics in Rawls political philosophy by normative method.