Abstract: In multiple attribute group decision making, because every expert has his own knowledge and expertise, different experts have different weights for different attributes. A new method to determine the Expert’s weights is put forward based on the TOPSIS method in interval-triangular fuzzy setting. If the evaluation value is close to the positive idea evaluation value and far away from the negative ideal evaluation value it will be given a large weight; Otherwise, the evaluation value will be given a small weight. Experience shows that the weight of experts determined by this method has a significant effect on solving practical decision-making problems. A new method of multiple attribute interval-valued intuitionistic fuzzy group decision making is presented in this paper, including the attribute weights are completely known, partly known and completely unknown. Finally, the feasibility and validity of this method are proved by our examples. 

Key words:  , Multiple attribute group decision making, Interval-triangular fuzzy set, Weight, TOPSIS