In the primitive society,people have been concerned about the problem of soul.When the ancient Greek philosophers expressed their own views on philosophy,they could not avoid the issues about the soul.After summarized the views of his predecessors,Aristotle gave us a distinctive and persuasive illustration.He regarded the soul as an actuality of the first kind of a natural organized body and provided a functional interpretation of soul; accordingly,he avoided his predecessors' trouble in explaining the soul,and solved the related issues of the soul effectively.