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本文讨论多准则合作型对策的若干问题．文中定义了Ｐａｒｅｔｏ最优安全策略与安全水平，给出了合作型对策协商可行集的约束条件，提出了改善的Ｎａｓｈ定理，研究了一类特殊问题最优威胁集的确定方法，并用实例对上述内容进行了应用验证．
This article discusses some of the problems with multi-criteria collaborative approaches. In this paper, the Pareto optimal security strategy and security level are defined. The constraints of the cooperative game negotiation feasible set are given. An improved Nash theorem is proposed. The method to determine the optimal threat set of a special problem is studied. Content has been verified.