Through hylomorphism, Thomas Aquinas established his theory about the structure of human being. The background of his working is from his study in Paris University, and in this period he begun his researching to the philosophy of Aristotle and the concepts about soul and body. Based on this philosophy, he offered his famous formula about the composite of human being: soul and body, as form and matter. In one hand his interpretation ceased the argues in 13 century, in the other hand, his theory becomes the foundation of Scholastics.