Abstract
The authors observed Blue Sheep (Pseudois nayaur) population in the Helan Mountain, Ningxia Province in November 1994,between July and Nevember 1995,respectively. It was found that the Blue Sheep preferred to elevation of 1800～2000 m in Helan Mountain.The Blue Sheep foraged primarily in the morning and at dusk. Of the 448 individuals observed,the average herd size was 5.5 individuals. The Blue Sheep were frequently seen in small herds of two to eight individuals (70.8%). Of the 403 Blue Sheep classified by sex,the ration adult females to males was 11.2, and the ratio of adult females to young was 10.44,the population showed a trend of increase. Hunting, human disturbance and livestocks were major threat against Blue Sheep's lives.
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