To solve the problems of generating emergency alternative, an emergency decision method based on evidence reasoning with considering total superiority degree is developed from the case matching and case selecting. According to the retrieval method, the similarities between source case and historical case are calculated, and the historical and current implementation effects of alternative are obtained. Then, the evidence reasoning is used to combine emergency evidence. By the way, the total superiority degree of cases can be calculated, and the most effective alternative is obtained. Finally, a coal mine emergency decision-making case is given to illurstrate the feasibility and effectiveness of the proposed method.