There are 278 varieties of vascular plants in 81 families in Siangyan, including the Red Cypress, Taiwanese Red Pine, Alishan Oak ,Taiwanese Red Maples, Kawakami Maples, Slipper Orchid (Cypripedium formosanum), and the Tumor-footed Fern. The forest of pine, red cypress, and mixed coniferous broadleaf trees is gorgeous. The wood-paved cypress trail is 680 meters and visitors can observe more than 30 Red Cypress and interesting species under the trees such as the Slipper Orchid (Cypripedium formosanum), and Wild Cotton. The Songtao, Songyan, Siangyan, and Songjin trails are 5830 meters long in total, and are lined by Taiwanese Red Pine. It is very enjoyable to walk along the trails with pines scattered throughout the trails and to be able to lightly touch them. Following the Songtao Trail, is the approximately 12-kilometer Siangyangshan- Shanchashan- Jiaming Lake National Trail, where visitors can fully experience the changes in the forest at high-altitude, such as Pine, Hemlock, Fir forest, Flaky Juniper, Yushan Bamboo and alpine flowers along the way. Due to the presence of the short Yushan Bamboo around Sancha Mountain and Jiaming Lake, the view is vast and boundless with seemingly endless Central Mountain range peaks to the distance. The charm of the blossoming mountains from April to September and the poeticism of Jiaming Lake are truly alluring.
There are 27 species of mammals, including the Formosan Yellow-throated Marten and Sambar. Sambar is most likely to spotted in the area from Siangyang to Jiaming Lake. There are 39 varieties of birds, of which the most common are the Formosan Laughing Thrush, Formosan Bowing, Taiwanese Firecrest , Coal Tit, Alishan Robin, and Nutcracker. Lucky tourists may also see the rare birds, Mikado’s Pheasant, and Swinhoe's Pheasant.