Abstract: Group crisis in college student population occurs both inside and outside universities, involving teachers and students. This kind of crisis is characterized by abruptness, sensitivity, subjective activity and extensive damage. Through literature review, Delphi and other methods, the study establishes a five-dimensional system that incorporates social culture, public opinion, social safety, social employment and social ethics, and puts forward the inner mechanism of the system. It argues that social opinion is a crucial factor in the outbreak of group crisis in college students.