Abstract: The transcendental imagination is of great importance in the Kant's Philosophy, on which Kant hesitated and conflicted greatly. As transcendental imagination of a “game space” between sensibility and intellectuality possesses original identity of time, the imagination and the time constitute essence of subject, so Heidegger discovered a shelter for his ideology in Kant philosophy, impelling finitude of knowledge into finitude of existent, and then started Ontological dimension of finite subject.

Key words: Heidegger, Kant, transcendental imagination, existence, time