The Guanshan Historical Trail was built during the Japanese occupation as a “barbarian management road” and was named the “Guanshan Traversing Police Road” at the time. The 171.06 km trail stretches from Liouguei of Kaohsiung County in the west, passing through Taoyuan, Meishan, Kuaimu and traversing the northern saddle of Guanshan. It then descends to Siangyan, passing through Wulu, Sinwu, Hairei, and reaches Guanshan of Taitung County. The section from Meishan to the northern saddle of Guanshan lies within Yushan National Park. When the Southern Cross-Island was build, it was generally constructed along this trail. However, half of the trail still meanders in the remote areas in the mountains and is slowly becoming forgotten. This study is based on this forgotten section of the trail. From July 1988 to May 1989, 12 surveys were conducted, amounting to 78 surveying days and 340 men-work. The focuses of the study were: the current condition and location of the entire road section; important historical and cultural data; sites and conditions of past and present tribes along the road; a survey of the police route in Liouguei and barbarian management road in the northern and southern banks of the Daluen River; and a survey of Yusuieshe where the Bunun leader Laho Ahmei established his base during the anti-Japanese struggle.