Abstract: Satre makes a deep study of human beings in capitalist society,and investigates into the freedom and liberation of individuals.His anthropological ontology goes through three periods including phenomenological ontology,the absolutely unconfined ontology "for itself" and the Marxism anthropological ontology of existentialism.It is indispensable for developing Marxism anthropology to meditate these three periods and to evaluate Satre s anthropological ontology objectively.