Abstract: Triplopus sp., Triplopus? jeminaiensis sp. nov.、Lophialetes sp. and Hyaenodontidae gen. et sp. collected from the Early Tertiary of Jeminay（850H11一1 2, 47。 29' N 85。88' E), Xinjiang by Geology Bureau of Xinjiang Uygur Autonomous Region in1985 are described in this paper. These newly found fossils demonstrate the existence Of Middle Eocene deposits in Jeminay area. And the mammal assemblage can be compared with Irdin Manha fauna of Nei Mongol and approximately equivalent to Obayla svita or Sargamys svita of western Zaysan basin. Its age is considered as Irdin Manha period.