Abstract: To classify and identified the nematode parasized in ruminant in Qinghai province, the mature nematode specimen parasized in Tibetan sheep, goat, yak, ox and camel was collected and classified systematically, by adopting classfication systems of Yamaguti（1961）. All those specimens belong to 24 genera of 15 families of 6 orders in nematade of Nemathelminthes Class, of which 85 kinds of nematodes were sorted out, among them 13 lung nematodes, 71 digestine nematode and 1 muscle nematode were classified.

Key words: Qinghai Province, Yak, Tibetiansheep, Nematode, Classification