Abstract: A number of mammal fossils were recently collected from the central part of the Hengduan Mountain ranges in northwestern Yunnan Province. The mammals described in this paper include a primate (Procynocephalus cf. P. wimani Schlosser, 1924), a hystricid rodent (Hystrix sp.), a perissodactyl (Equus yunnanensis Colbert, 1940), and a few artiodactyls (Cervavitus ultimus (Lin et al., 1978), Eucladoceros sp., Cervus (Rusa) yunnanensis Lin et al., 1978, Muntiacus sp., Gazella sp. and Leptobos sp.) In addition to those described, other fossils (complete or fragments) include Cervus (Sika) sp., Bison sp., rhinocerotoid (Perissodactyla) tooth fragments and hyaenid (Carnivora) coprolites. Overall the fossils indicate an early Pleistocene age. In this mammal fauna cervids (deers) and bovids (oxen and sheep) were predominant, which suggests a mixed forest2 grassland environment. In this fauna there are many identical forms with those in the Yuanmou Man fauna; in addition, there are also some taxa that are similar to those in northern China, which sug2 gests some kind of biogeographic relations.