The Evolution Of Nasal Rhythm Since The Medieval

In this paper, to solve the problem that how a more detailed rhyme system is to evolve into modern Chinese simpler one in Mandarin, the whole history of the develepment of language since The Medieval is divided into three stages:the Medieval,Yuan Dynasty, Ming and Qing Dynasties. In every stage,we choose materials reflecting Chinese commen language to insure that our research be confined in chinese commen language.In the stage,we first choose materials in order to we find the nasal rhythm through comparing different materials,then the changes are found through comparing different nasal rhythms.last,all changes are arrenged in succesion to achieve our goals.Using the specific material of different times, we find the evolution of nasal rhythm, through vertical historical and horizontal comparison between the different materials.