Abstract: We establish a multi-attribute large-group emergency decision-making method to address the entropy of conflict risks and regret aversion. First, we consider the mental behaviors of decision makers and calculate the perceptible utility values of all emergency plans in light of regret theory. Then, we cluster the perceptible utility matrix of the members and define and correct the weights of each cluster, as well as decision makers accordingly. We prioritize emergency plans in accordance with their perceptible utility values and entropy of conflict risks, the latter of which registers each member's entropy of the conflict risks based on the conflict values of each cluster. Finally, we apply a case study to prove the feasibility and efficiency of the method..