Xinjiang province is one of the important bases of yak and yak production in China.The existing nearly 400000 head, the government of the Autonomous Region decided after a number of years will be the number of yaks proliferated to 1000000, in order to make full use of Xinjiang's vast region and grassland (my area north and south of the Tianshan Mountains100 million mu of mountain pastures for yak feeding). Yaks are strong resistance, there is nolarge-scale epidemic.However, parasitic disease in the yak region have been spread, which has become a major obstacle to the yaks healthy ,has caused very serious harm and loss of yaks and development of yak production industry in china. The study, a detailed understanding of the yak parasitosis infection rate and intensity of infection, epidemic regularity and damage degree. In order to assess the harm, provides the basis of proposed suits rregion for yak parasitic disease control plan; the area of parasitic disease, insect yak best planning to establish the best deworming program. To promote the development of Xinjiang characteristic industry, so as to guarantee the yak industry.