Abstract: As a complete reality of human beings,"body" includes both physical and psychological aspects.The hypothetical separation of body and soul is the product of the old philosophy,which fundamentally distorts and violates the authenticity of the body and the richness of real life.Because activity (labor,practice) is naturally the unity of thinking and being,and body and soul,Marx's philosophy,which takes "perceptual activity" as its ontology,eliminates the opposition of thought and bridges the division of body and soul.On the basis of the new "activity ontology",the totality,naturalness,sociality and practicality of the body appear gradually,and all existence is explained in a self-consistent and unified manner.Therefore,Marx's new philosophy can be called "perceptual activity" ontology or "practice" ontology.

Key words: Marx, body, perceptual activity, practice, ontology