Abstract: Diverse in style of the poetry creation in the mid-and late Yuan dynasty, two styles pursuit has dominant in nature:the first was elegant and standarization, and the second was strange of insurance.However, the two seemingly different styles pursuit had a common psychological motivation-creation of a private state of mind, and showed the same aesthetic taste-"Yi" Fun.The so-called private mentality, mainly displayed in two:first, the narrow content and less concerned about society and life;second is the narrow realm, reflected by a lack of intensity and lack of appeal.Creation of such a private mentality formation was closely connected ewith the specific cultural background in the mid-and late Yuan dynasty.