Abstract: During the field work of 1998 in the north Junggar Basin of Xinjiang Uygur Autonomous Region, rich fossils were found from the Ulunguhe Formation which was originally dated as Cretaceous in age. Probe sample of ca. 400kg for screenwashing was taken from locality XJ98024 north of Tieersihabahe. From about 1.0kg of residue 170 teeth of micromammals were sorted out, altogether 31 species belonging to 21 genera, 17 families and 7 orders have been recognized in this fauna, many of which are elements of the late Oligocene fauna of Taben buluk. Four teeth of them belong to dormice, which were identified as Glirulus sp. and Gliridae gen. et sp. indet. Therefore the dormice from Tieersihabahe are the earliest dormice found in China, the first recovery of Oligocene dormice from China and the Glirulus sp. is the earliest record of this genus.