The issues of human nature are the vital subjects which concern thinkers in every dynasty of China. Is human nature good or evil? Or is it the mixing of both of them? This used to be an issue about which the public opinions or views are diver- gent in the record of the Confucianists' ideologies. The best five articles of the collection of Han Yu's compositions are the dissertations titled in the word “analyse (yuan)”, and people called them “five analysis (wu-yuan)”. The theme of “wu-yuan” is to expound and advocate the basic ideologies of the Conf ucianists. It is one of the signif icant works to study HanYu's thoughts. “analysing the nature (yuan-shin)”, which is one of these works, is the important article. In this article, Hail Yu observes the issue of human nature through a philosophical point of view.