Abstract: Some typical order functions of Vague values are reviewed and compared, and an improved order function is proposed on the base of relatively superiority, amount of known information and abstaining. Considering both agreement degree of decision opinions and the degree of importance of each expert, a method for aggregating individual Vague opinions is improved. Finally, a numerical example is given to apply the proposed method. Results show that it is convenient to aggregate Vague opinions during group decision making by similarity measure and order function of Vague values.