For solving multiple attributes group decision-making (MAGDM) problems where attribute values are in the form of interval-valued intuitionistic trapezoidal fuzzy numbers and attributes are associated with each other,an approach was proposed based on interval-valued intuitionistic trapezoidal fuzzy geometric weighted Bonferroni means (IVITFGWBM) operator.The concepts of interval-valued intuitionistic trapezoidal fuzzy numbers were introduced,and interval-valued intuitionistic trapezoidal fuzzy geometric Bonferroni means(IVITFGBM) operator and IVITFGWBM operator were defined based on operational laws and Bonferroni means operator.Meanwhile,the related properties were analysed,then a model of multi-attribute group decision making was constructed based on IVITFGWBM operator,which was for making decisions combined with sort methods.The approach was further applied in group decision-making problems of supplier selection,and the results show that the developed approach is feasible and effective.