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基于三种经典区间直觉模糊集结算子及最优化方法,文章提出一种新颖的三支群决策模型与决策方法.首先,论文阐述了具有区间直觉模糊评价信息的三支群决策问题,采用区间直觉模糊加权平均算子、混合加权平均算子及几何平均算子分别集成不同决策者提供的区间直觉模糊评价信息,以便获得区间直觉模糊综合损失函数评价结果,并讨论损失函数之间的大小关系.其次,基于最优化方法建立一种确定三支决策概率阈值及规则的优化模型对.在此基础上,提出基于区间直觉模糊集结算子及最优化方法的三支群决策模型.最后,算例与比较分析表明所提出模型的有效性和优势.“,”A new three-way group decision method is proposed based on three representative interval-valued intuitionistic fuzzy(IVIF)aggregation operators and optimization methodology.First,we elaborate on the three-way group decision problem with IVIF information,use the IVIFWA,GIVIFWA and IVIFWG oper-ators to aggregate these information provided by experts and obtain collective evaluation results of IVIF collection loss functions,and some relations among collective loss functions are discussed.Second,based on the aggregated loss functions,we construct an optimization model pair for capturing the thresholds and three-way decisions with the aid of optimization methodology.Third,we develop a three-way group deci-sion model based on these three aggregation operators and optimization methodology.Finally,an illustra-tive example and its related comparison are given to verify the rationality and advantage of our model.