Abstract: Aimed at the disadvantage for existing large group decision methods only considering the independent decision-attributes, a new large-group decision method based on binary-relation among decision attributes is proposed. The binary relation is used to form the attribute relationship matrix of preference vector of group members. With the relationship matrix which is 0-1 matrix and its property of norm, the clustered measurement model between preference vectors of two decision members is constructed. Based on the model, a preference aggregation method for large group decision making and decision alternative ranking is proposed. Finally, the method is applied in the case of emergency management ability evaluation of major snow disaster in Hunan province of China.

Key words: large group decision making, binary relationship, relation matrix, preference aggregation model