This thesis is to deal with the problem of subjectivity in Heidegger s understanding of Human being. In this purpose, the subjectivistic misunderstanding about Heidegger s concept of an existentially a priori anthropology has been looked into, and then whether his understanding of human being is indeed subjective analyzed. By doing so, We can find his existential interpretation of human being out not a subspecies of subjectivism. His anthropological interest in the existentialism differs from conventional anthropologies which makes stand human essence on the fundamental ontology. The discourse of anthropological reason can not be got out of the realm of subjectivity that estimates human value, because the meaning of Being does not matter in it. Heidegger, thus, casts the question of what is the way of human original knowledges that can take the place of a subjective mind. Heidegger says that is the Understanding (Verstehen). The Understanding is Dasein s Projection held in Temporality. It is the way of existence which comes into the open realm of Being. It might seem a absorption in the subjectivity that the essence of human Having been (Gewesen-sein) is ecstatical, because heidegger s Dasein keeps calling for resoluteness of human authentic self in the present time