From November 2016 to April 2017, we collected four rodent specimens from Jinchang, Babu and Majie in Malipo County, Yunnan Province, China. They are different from any mammalian species described so far in China and have been identified as Tonkinomys daovantieni Musser et al., 2006, a new record of the genus in China. Its main features are: dorsal pelage grayish black with semi-spinous, dense fur, ventral pelage grayish; a thick, bicolored tail considerably shorter than length of head and body, the distal 1/3 white, the proximal 2/3 of its dorsal and lateral dark brown and ventral white; the first and the second molars consist of tightly pressed rows exposing chunky chewing surfaces in the shapes of two parallel chevrons and a roughly diamond-shaped chewing surface, the third molar consists of a front chevron formed by union of protoconid and metaconid and behind that a large oblong structure likely representing the complete fusion of hypoconid and entoconid. Each lower molar has two roots. The Cyt b sequence is 97.7% identical to the specimens from the type locality and phylogenetic analysis by maximum likelihood algorithm supported the two populations to be monophyletic (BS=100%). This finding is the first recorded distribution of genus Tonkinomys in China and outside of the type locality.