Abstract: Emergency scenario construction mainly includes three subjects of the " Object to cause disaster", "hazard bearing body", and” Disaster Resistance". It becomes a key link in emergency preparedness emergency system construction and practice on each subject from how to identify and extract key scene elements. The study of university social security incidents as the study object plays an important role in the construction of emergency scenario evolution research foundation, which uses AHP and entropy method to explore the situational elements of weight distribution, trying to extract key scene elements.