Disasters caused by massive movement have always been a threat to Taiwan. Therefore, the course will start with the introduction of debris disasters from the viewpoints of geomorphology, geology, and soil science. In-depth discussion on the characteristics of debris flow as well as its flowing phenomena will be conducted during the middle third of the class period. Mohr-Column Failure theory will be used to identify the incipient motion of debris flow. At the end, the early warning system and control structures used in other countries as well as in Taiwan will conclude the entire class.