Abstract: The aggregation approach of three-point interval linguistic judgment matrix and complementary preference judgment matrix is studied in this paper.Firstly,the translation approach of two kinds of preference information is put forw ard.Secondly,the information change during the translation process is studied according to the angle of the order consistency and complete consistency.Thirdly,the definition of the group consistency degree based on the grey relationship is put forw ard and the decision maker's weight is suggested.Finally,the aggregation method of the two kinds of three-point interval preference is suggested.The application steps are showed by an example.

Key words: group decision making, three-pointinter valling uistic judgment, three-pointinterval complementary judgment, preference translation, aggregation