Abstract: In 1981, the senior author and Prof. Li Peixian (Institute of Geology, CAGS) discovered a new primitive anteosaurid dinocephalian skull and numerous other tetrapod fossils from the Upper Permian at Dashankou, Yumen, western Gansu. skull, described below, is not only the first occurrence of the carnivorous dinocephalians, but also the first nearly complete skull of dinocephalian reptiles in China. Moreover, western Gansu, following Russia, Kazakhstan, South Africa and probably United States, becomes another very important locality of occurrence of the Anteosauridae.