Abstract: How to evaluate the emergency management performance of mass incident is the key problem for policymaker to improve the social management. Performance evaluation of emergency management in mass incident has the unconventional characteristics with conflict of value judgment among stockholders, structural embedability that a mass incident happens in the special context of social structure, and linguistic fuzziness about the evaluation information. Considering the conflict of value judgment among local governmental officer, social vulnerable group and interest group, the 2-tuple linguistic model of performance evaluation is proposed with the maximal deviation principle.Firstly, the index system of performance evaluation of emergency management is build under the dimensions of social structure, emergent strategy and evaluating index, which includes efficiency, equity, convergence, stability and flexibility. Secondly, in accord with the disposal principles declared by Chinese government that local government should "facilitate the resolution of the outstanding issues with worse public opinion", the attribute should be given the higher weight because the larger deviation is, the better reflecting the conflict. Choosing the survey data of the boiler house demolition case in 2011 Dalian city, three multi-attribute decision-making models are compared with each others and the index sensitivity analysis is discussed. The strategy of neutral government as intercessor and the far-sighted strategy have the better performance, and the tit-for-tat strategy has the worst performance. Relative to fuzzy comprehensive evaluation model and 2-tuple linguistic model with the minimal deviation principle, the maximal deviation principle is better reflected the conflict characteristic of value judgment. The contribution of this paper is a new problem in the field of emergency management is proposed, which is how to evaluate the emergency management performance of mass incident with conflict of value judgment among stockholders. The resolving method should be maximal deviation principle, which can reflect the conflict of value judgment.

Key words: mass incident, 2-tuple linguistic performance evaluation, emergency management, maximal deviation principle, multiple attribute decision making