关键词: 康德伦理学, 存在和应当, 人道主义, 源始伦理学

Abstract: Heidegger holds a special view in respecet to Kant's Kritique der Practische Vernunft,compared to his other main works.In his works concerning about Kant,Heidegger has never discussed the second Kritique directively,which at fact inexplicitly inclcuding a radical and deep thinking and critic of it.Because ought (Sollen) is the essential concept in the Kant's ethics,Kant accepted the definition of man as the ratinal animal which is a fundmental view of man in the west metaphysics since the beginning of philosophy.Heidegger takes Kant's ethics as an essential moment and phase in the development of western metaphysics,as a particular point in the Platonist doctrine of idea.The emptiness of man's essence is also the reason why humanism is equal to subjectivism at last,and Kant's free will and rule of morality is nothing but the necessary consequence of this kind of thinking of Humanism.

Key words: Kant's ethics, Sein und Sollen(to be and ought), Humanism, Original ethics