Abstract: From 2019 to 2021, the small mammals in Xuebaoding National Nature Reserve were investigated. A total of 10,729 traps and 3530 barrels were set in 3 vertical transect in Tucheng, Huya and Si 'er, and 1556 specimens were collected. There are 4 orders, 14 families, 38 genera and 56 species of small mammals in the reserve. Compared with the previous checklist, 21 species of the 52 species listed in the original checklist needed to be revised, among which 12 species were identified incorrectly or the data sources were incorrect, and 9 species belonged to the change of taxonomic status. According to the latest research results, the Latin names of 10 species in the previous list were changed. 16 species of small mammals were newly discovered, and the checklist of small mammals in the reserve was updated, which provided basic information for strengthening the protection of resources in the reserve.