Evolution of the view of literature proper and changes in the poetic styles during the Tang Dynasty

Innovation to the view of literature proper leads to considerable changes in literary ideas,further in principles of literary creation,methods of writing,even themes,system,style and literary criticism,and eventually achieving transformation of literay theories.During the Tang Dynasty,the view of literature proper experienced three phases: following Dao,expressing Zhi and expressing Qing,which exerted direct influences on the trends of poem creation of the Tang Dynasty.