This is a field study centered on hiking trails and forest roads in Dongpu, Yushan National Park. To ensure the accuracy of the survey, 11 fixed locations were selected along the Batongguan Historical Trail, the Shalishan River, Shenmu Forest, and the southern trail in Lelegu where a detailed search was made of the mountain forests and plains. Researchers and two mountain tribe guides conducted survey on different fixed locations each month. At each fixed location, 1-3 transects were decided on depending on geographical conditions, and mammals were searched for along each transect. Data recorded included sightings, calls, and examinations of traces left in the wild. 24 mammals were recorded in the actual field study. These animals can be divided into the following categories: insectivore, rodentia, carnivora, artiodactyla, and primates. Rodentias were the most commonly recorded, with a total of 7 species. According to interviews with mountain tribe members, hunters, and mountain workers, there is still a presence of wild rabbits near Dongpu village, and traces of pangolins were also found in the mountain areas near the Shenmu village. Mammals present in the study area over the past 30 years included the Leopard Cat (Felis bengalensis chinensis), the small Chinese civet (Viverricula indica taivana), and the crab-eating mongoose (Herpestes urva), but in the past few years there have been no traces of sighting of these animals.