Slope failure often takes place in the YushanNational Park due to earthquake or heavy rainfall; these slope failure may cause the damage of the trail system and facility in the park. Prompt repair and maintenance can usually recover the damaged trails shortly after their damage. However, it is potentially dangerous for mountain climbers encountering a slope failure. This study explored the potential hazards due to the possible slope failures adjacent to the trail system in the Eastern region of YushanNational Park. The study also investigated the types and the causes of slope failures.