Yumidong cave (30°50'44.4"N, 109°38'09.2"E; elevation of the cave entrance is 1100m) is an important Paleolithic site, located at Wushan County, Chongqing Municipality. A great number of chipped stone artifacts and mammalian fossils have been excavated from this site during the past several years. In this paper, the mammalian fossils were roughly observed and correlated with the stratigraphic succession to discuss the age of the site. The number of identified fossils from this site is more than 3000,mainly the Ailuropoda-Stegodon fauna of South China, containing Euroscaptor longirestris, Parascaptor leucurus, Anourosorex squamipes, Sorex sp.,Soriculus leucops, Soriculus sp.,Blarinella quadraticauda, Chodsigoa salenskii, Scaptonyx fusicaudus, Rhinolophus pearsoni, Myotis sp., Callosciurus erythraeus, Belomys pearsoni, Trogopterus xanthipes,Pteromys volans,Petaurista xanthotis, Tscheskia triton, Eothenomys custos, Eothenomys sp., Typhlomys cinereus, Rhizomys sinensis, Hystrix brachyura subcristata, Hystrix magna, Atherurus macrourus, Apodemus latronum, Vernaya fulva, Niviventer andersoni, Niviventer confucianus, Niviventer excelsior, Niviventer sp., Rattus norvegicus, Macaca sp., Stegodon orientalis,Elephas maximus,?Choerolophodon sp., Proboscidea indet., Cuon alpinus,Cuon antiquus, Canidae indet., Ursus thibetanus, Ailuropoda melanoleuca baconi, Arctonyx collaris, Paguma larvata, Crocuta crocuta ultima,?Homotherium sp., Panthera tigris, Lynx lynx, Equus sp., Stephanorhinus kirchbergensis,Megatapirus augustus, Sus scrofa, Cervus unicolor, Cervus sp., Muntiacus muntjak margae, Capricornis sumatraensis, Naemorhedus goral, Bibos gaurus grangeri. This assemblage shows the age of site is late Middle to Late Pleistocene. The section of Yumidong cave is mainly of the alternation between breccia and clay, indicating several times of climate changes. Combined with the mammalian fauna, the age of deposit in Yumidong cave should be corresponded to MIS 8 ~1,about 300ka to present. Additionally, the zooarchaeological observation shows the human activity played an important role in the formation of fossil assemblage and the hunting behavior might be present. The potential of the Yumidong cave fauna may supply new evidence to explore the origin of modern human behavior.