Abstract: During the early 1980 ' s, a team composed of the members from the Institute of Geology, Chinese Academy of Geological Sciences and Institute of Geology, Bureau of Geology and Mineral Resources of Gansu resurveyed the terrestrial Permian and Triassic deposites of Qilian Mountain area. A skull of dicynodont was collected from Lugou, NE 30km of Sunan by the 2nd author of the present paper. On the basis of its large size, a single pair of the maxillary tusks in the upper jaws, the postorbital tending to overlap the parietal posterior to the pineal foramen, the septomaxilla merged smoothly with the dorsal surface of the snout, etc., the specimen is referable to genus Dicynodon, and represents a new species.