Tibetan macaque (Macaca thibetana), a rare primate to Shaanxi Province, has exhibited a rapid population decline throughout its range in recent decades. This study conducted from August to December 2013 that aimed to described the distribution, and age composing of this species in Micangshan National Nature Reserve, we choose special area as sample place by interviewed, and then starting to investigate by V-shaped transect route survey. When a group was observed, counting all individuals and recording the age and sex of group members, as well as the height at which the group members were observed, the habitat structure at that location. our survey revealed that one group of Macaca thibetana was living at deciduous broad-leaved forest in lower edge of the middle of mountain around Chayuan village (107°38′～107°39′E, 32°62′N, Height: 1 424 m～1 589 m, Figure 1), including about 35 individuals, which were composed of 46% adults (the exterior character of adult individual is identical to the photo in Figure 2) and the remainder (54%) un-adults, and the sex ratio of adults in the group was 2.4. Depend on this age composing, we deduced that the trend of this group was increasing. It was first time found that Macaca thibetana was distributed around the village of Chayuan, and perhaps to be slowly increased in Micangshan National Nature Reserve.