Abstract: On the basis of observing the difficulty of metaphysical ontology of philosophy，Kant’s Copernican revolution is transcendentally trying to endow the perceptual world with reality which was already abandoned and rejected by Platonism through subverting the old ontological framework.In the process of implementing the “transcendental turn”，its internal contradictions and dilemma are concentrated on the section of “subjective interpretation”，which ultimately can’t really break through the barrier of traditional philosophical metaphysics.

Key words: perceptual world, ontology, transcendence, Kant, Copernican revolution