From July, 2013 to May, 2014, infra-red cameras were set at 32 sites to monitor the mammals in Beijing Wulingshan National Nature Reserve. These cameras cumulatively worked 3630 days and a total of 494 available photos of mammals were obtained.. Ten species of animals belonging to 4 orders 7 families were identified, including roe deer (Capreolus capreolus), common goral (Nemorhaedus goral), hog badger (Arctonyx collaris), rock squirrel (Sciurotamias davidianus), wild boar (Sus scrofa), Eurasian badger (Meles meles), leopard cat (Felis bengalensis), Siberian chipmunk (Tamias sibiricus), cape hare (Lepus capensis) and Siberian weasel (Mustela sibirica). These mammals were mainly palaearctic species (70%) based on their distribution patterns. The most common species recorded by cameras included roe deer , rock squirrel, common goral and hog badger. Wild boar, Eurasian badger, leopard cat, Siberian chipmunk and cape hare were also frequently captured, while Siberian weasel was rarely recorded. The relative abundance of animal species at different altitudes and habitats, cumulative number of species recorded and camera working days were discussed, as well as the G-F index of mammals .