Abstract: In 1961, Xue Xiangxu and Wang Yongyan collected a lot of mammalian fossils from Bajiazui of Qingyang County, Gansu Province. The fossils come from the sandy beds in the bottom of the section, including Canis chihliensis, Meles cf. M chiai, Hyaena cf. H. licenti, Megateron sp., Epimachairodus sp., E. cf. E. crenatidens, Felis sp., Hipparion cf. H. sinensis, Sus cf. S. lydekkeri, Megaloceros sp., Cervus sp., Gazella sp., G. cf. G. sinensis, Bison palaeosinensis, Bovidae indet., Uospalax cf. M. arvicolinus, and M. tingi, etc. (Wang et al., 1966, 1982). Among the materials there are many skulls, mandibles, cheek teeth and limb bones of the genus Equus. A new species of Equus is described in this paper. NWUV is the prefix to the vertebrate fossils in Departnent of Geology, Northwest University.