Abstract: Klamelisaurus gobiensis, new genus and species of Saurischia is described briefly in this note. Klamelisaurus gobiensis is a large and midtrantional kind of sauropod, 17 m in length. The teeth rather massive and spatulate in form. There are 16(?) cervical, the centrum obviously opisthocoelous, the neural spines rather high. These posterior 3 cervical neural spines are fused. The cervical centrum average length is 1.5—2 times that of dorsals. There are 13 dorsals, the centrum of it is opisthocoelous, the cavernous structure is rather developed on the side of the centrum, but the lamellar structure simple and massive on the neural arch and spines are very thick and strong. Five sacral vertebrae are fused. The neural spines of caudal vertebrae stick in shape and rather toward the back. The scapula very thin and long, the coracoid slender. The pelvic girdles heavy. The Ilium massive with a less developed upper flange. The public peduncle occurs on the front half of the ilium blade. The ischium rather thin, but the well developed pubis distinctly flat and slightly curved. The proximale end of humerus thicken and curved, The ulna much Ionger than the radius. Thé radius somewhat straight. The femur thick and somewhat flat with slender articular head and fourth trochanter is situated toward the upper part of the ventral surface of the shaft. The tibia is somewhat no developed and shorter than fibula. The ratio of forearm to hindarm is 3 to 4. In sum, the Klamelisaurus gobiensis belong to the family Brachiosauridae, which contains 4 subfamilies: Cetiosaurinae; Brachiosaurinae; Camarasaurinae and Euhelopodinae, but the Xingiang specimen is not part of any old subfamilies of the family Brachiosauridae. In fact, it belongs to new subfamily named Klamelisaurinae. The Klamelisaurus shows a lot of primitive feature, even though it is an essentially advanced sauropod. It obviously represent an intermediate form of evolutionary stage of sauropod, so the age of the fossil bearing bed of Wucaiwan Formation is considered to be Middle Jurassic, based upon the result of the discussion of the Klamelisaurus and other members (Monolophosaurus; turtles and crocodiles) of Wucaiwan fauna.