There is currently little information on resting behavior of wild Guizhou snub-nosed monkeys (Rhinopithecus brelichi). This field study on the ecology and behaviors of this species was conducted in Fanjingshan National Nature Reserve, China. Parameters related to resting behavior including the posture, forest/tree strata, support diameter and inclinations, and numbers in huddling groups were recorded by ad libitum sampling method from December 2008 to April 2009. Our results showed that sitting was the most common posture (99%); the middle tree stratum was most frequently used (52%) during resting periods; the medium diameter of support branches (5﹣10 cm) and the approaching level of support branches inclinations were most frequently used (Table 1); and huddling group most frequently comprised of two individuals. And there was a negative correlation between tree strata and the diameter of support branches (r =﹣0.478, P < 0.05, n = 50). There was also a significant difference of average huddling group size between different tree strata (Fig. 1, Fig. 2). Vertical distribution of support resources may influence both huddling group size and tree strata use in Rhinopithecus brelichi.