Analytic hierarchy process(AHP) is a method usually used in group decision making. The process of group decision making using AHP is essentially an individual preference incorporating process of the decision maker. For how to incorporate effectively different forms of preference information, a solution is proposed, which makes consistency preference of the decision maker group form by decision alternative adjustment. The deference of decision preference of each division on basis of group division is made clear by means of decision information of the decision maker, and the direction of employing flexibly AHP for consistency formation of group decision making is proposed. Thus, an effective dynamic group decision making process is formed.