Abstract: The dynamics of daily activity are the activity intensity and periodic change pattern of animals in different periods of the day, which are closely related to metabolism control and energy expenditure cost. From August 2015 to August 2017, the daily activities of Macaca thibetana in different seasons were examined in Chishui Alsophila National Nature Reserve, with infrared camera monitoring. A total of 105 independent pictures of M. thibetana(out of 687 recognizable pictures) were collected with a sampling effort of 6370 camera-days. The analysis of daily activity patterns showed that M. thibetanawas a typical diurnal animal, with daily activity peaks at 12:00-16:00 with the shape of ‘M’. There was no significant difference of daily activity between rainy and dry seasons (P>0.05). In dry season, daily activity time was decreased in the sunrise period and the activity peaks delayed from midday to afternoon as compared to rainy season. Temperature range of daily activity was -2 to 34 ℃ along with the change of annual temperature, among which 15-25 ℃ accounted for 59%. Our results reveal the seasonal variation of daily activity patterns of M. thibetana based on the infrared camera and provide scientific basis for the indepth understanding of the behavioral ecology ofM. thibetana.