The information of Tianshan argali (Ovis ammon karelini) that distribute in eastern Tianshan Mts. has been rarely reported except Gao et al. (1997). In order to know the status of Tianshan argali since Gao’s report, from 2010 to 2013, we investigated the population of Tianshan argali in Mori International Hunting Ground of Mori County every summer by using the strip transect sampling method. The size of survey area is 94.67 km2 in 2010 and 2011, 72.97 km2 in 2012 and 2013. The results showed that, the densities of Tianshan argali in this hunting ground in 2010 and 2011 are 1.33?0.29 ind/km2 and 1.59?0.40 ind/km2 (Table 1). However, by using the non-parametric Mann-Whitney U test, the population density significantly decreased to 0.35?0.08 ind/km2 and 0.29?0.17 ind/km2 in 2012 and 2013 due to the continuous hunting for local museum. During the 4 times survey in summer from 2010 to 2013, totally 319 individuals in 83 groups were recorded, mostly are female groups (70 individuals in 31 groups) and Mother-offspring groups (106 female individuals and 80 lambs in 33 groups), only 11 male individuals in 10 groups, and 52 individuals in 9 groups are can’t recognized due to the long distance. This indicated that Mori International Hunting Ground was mainly inhabited by the female argali and their lambs. The group size of Tianshan argali Mori International Hunting Ground ranges from 1 to 17 (Fig. 1), with the mean group size is 3.84?0.35 individuals per group, which is significantly smaller than other parts of Tianshan Mountains due to relatively low level of food resources. And the relatively higher lamb to female ratio (45.5 : 100) indicated that Mori International Hunting Ground is the ideal habitat for Tianshan argali.