Abstract: The fossils forming the subject of the present study were collected from Da shankou, a Late Permian locality near Yumen, Gansu, which was first found by the last author in early 1980's. A trial excavation at this site proved that there exists a fossil-bearing lens containing some articulated skeletons on lower tetrapods and a huge number of isolated bones. Then, a project "Study of the Late Permian vertebrate fauna in Qilianshan and its paleobiogeography" was proposed and supported by the National Sciences Foundation in 1990. In the field seasons of 1991 and 1992 numerous amphibian and reptile remains including temnospondyls, dinocephalians, eotitanosuchians and bolosaurs were collected. The Yumen assemble is comparable to those of Zone II of Russia and Tapinocephalus zone of South Africa. A thorough preparation is still in progress and the following deals With bolosaur among the fauna. The stratum of the locality and detailed descriptions of the fauna will be given to appear seperately.