Tatachia and Mt. Yushan is the most important recreation area of Yushan National Park. It has the vulnerable alpine ecosystem threatened by global warming and heavy recreational pressure. We started camera trapping at Tatachia from 2009 April and extended to Mt. Yushan trail from 2010. We continue camera trapping with extra effort around the Paiyun lodge. We also conducted vegetation survey and 24-hour recording survey of birds at each camera trap site. In addition, camera traps were placed at Mt. Yushan trail to record the activity and occurrences of hikers. Camera traps, remote sound recorders and field surveys documented 22 mammalian species, 63 bird species, 2 frog species, and 176 plant species. Activity patterns of 8 mammals and Mikado pheasant (Syrmaticus mikado) were analyzed. Sambar deer (Rusa unicolor swinhoii) was significantly more active at night time. Yellow-throated marten (Martes flavigula chrysospila) was mostly diurnal, while Siberian weasel (Mustela sibirica taivana) was more active at night time. With regards to the distributions of larger mammals, we calculated occurrence indices from camera trapping for mammals according to VERP regions. Sambar deer population seems increasing and may induce increasing browsing and disturbance pressure to the forest understory. It is necessary to monitor the impacts from the increasing sambar deer population to the biodiversity of understory vegetation. Monitoring of hiker activity revealed the diel activity patterns. Sambar deer had significantly higher nocturnal activities near trails. Moreover, Formosan serow (Capricornis swinhoei) and sambar deer tended to avoid hiker peak hours at areas closer to trails. Sambar deer, yellow-thraoted marten, Siberian weasel, squirrels and rodents except Taiwan field voles (Microtus kikuchii) has highest occurrence rates near the Paiyun lodge. It is very likely sambar deer and rodents were attracted by the hiker trash and more minerals from human urines. And predators follow prey to exhibit high occurrence rates nearby the lodge. But the Taiwan field voles are plant eaters and don’t benefit from human food. They, in contrast, face higher predation pressure. It is recommended to clear the trash pile near the lodge. In summary, it is necessary to further monitor and assess the impacts of human activities to these vulnerable larger mammals and establish sound management for human activities and conservation of wildlife.