Abstract Wolverine (Gulo gulo) distribution in China is small, being found only in the Great Khingan Mountains, northeast China and the Altay Mountains, northwest China. It had been category Ⅰstate key protected wild animals because of the rarely population. Some studies of wolverines have been done in the Great Khingan Mountains but few in the Altay Mountains. In 2013-2016, we surveyed six chosen ranges to estimate the population size and density of wolverine in the Altay Mountains using a line transect method, a trace method, a questionnaire survey and infrared cameras. As a result, we directly observed and captured wolverines in Kaba, Burjin (Kanas Nature Reserve), Altai (Xiao donggou), Fuyun (Kurmut), Qinghe (Qinggil River). The population size in Altay Mountains was estimated approximately to be 97-166 individuals, from which the density was estimated to be 2.57-4.39 individuals/ 1000 km2. This scarce population may be related to grazing pressure, reduced food resources, habitat loss, or the increasing interference of human activity. As well, the conflict between wolverines and livestock and the border fencecould be another reason.