Abstract: Yunnan and its adjacent provinces:Sichuan,Guizhou,Guangxi and Tibet in China belong to Southeastern Asia.Based on the standpoint about the wide distribution of reptiles,we study the reptilian fauna of Yunnan and those of Southeastern Asia as well as of southern Asia as a whole,so as to explain the identity of origin for the reptiles of southeastern Asia.By this research,the problem for the origination of Yunnan reptiles are effort to be resolved.In this paper,after a comparison of the distributions of the families,genera and species of reptiles in Indian Peninsula,Southeastern Asia and the adjacent islands,with Yunnan and the neibour provinces of China by the macroscopic method,we have found that the fauna of different regions of southeastern Asia are different in genus and species level,we have also noticed the tendency that the quality of genera and species is constantly reduced from west to east,and from south to north,but in the sense of family level,it is very similar.