AbstractUsing Hennig’s cladistic principle,in this study,we analysed and coded 32 cranial and external characters of five Dremomys species distributed throughout the mainland of southeastern Asia. With Paup 4. 0b10 cladistic software,the cladistic phylogeny of five Dremomys species were reconstructed. The results indicate that D. pyrrhomerus and D. rufigenis are valid species; D. lokriah is basal to the others,and the second is D. pernyi; the cladistic relationships between D. pyrrhomerus and D. rufigenis are closest,and D. gularis acts as their sister group. Based on these five Dremomys species’cladistic phylogenetic pattern,we also explore the relationships between differentiation and dispersal of species and environmental evolution.