Perceptual object activity is an implicit ontological concept in Marx's Manuscript.Marx affirmed the principle of sensibility which Feuerbach used to overcome the religious attributes of the old philosophy,and regarded the sensibility of restoring reality,difference and diversity as the essential power of man,and the real man as the perceptual existence.Marx recognizes the greatness of dialectics which Feuerbach failed to see,that is,the driving principle and the creation principle of dialectics,thus sublating Hegel's dialectics regarded real man as the historical existence of creative activities.The real man in Marx's eyes is the man of perceptual object activity.Only by starting with"perceptual object activity"can we accurately grasp Marx's"real man"and understand how Marx realized his critique of classical political economy with a new understanding premise.