Abstract: The effective aggregation of preference information is one of the most important problems in the process of group decision making.Different types of preference information need to have different aggregated approaches.Basedon the definition of the consistency of fuzzy judgment matrix,an op timizatio n mo del is set up to obtain an aggregated approach in group decision making.And several important properties such as the relationships between the group fuzzy judgment matrix andfuzzy judgment matrix provided by every decision maker are studied.

Key words: fuzzy judgment matrix, group decision making, aggregated approach, consistency