Zhu xi and his colleagues contributed tremendously to the establishment of "subject atmosphere" and its "Domino effect of consensus".

Considering the consistency and similarity of judgment matrix,the definition of consensus degree in AHP group decision-making,which is used as the basis to determine whether to stop the interactive process,is proposed.

In order to make the decision-making more objective and accurate,basing on the distinction between experts static weights and experts dynamic weights,the paper researches the method to decide experts dynamic weights in interactive decision-making and brings out a definition of consensus degree.

This article starts from constructing consensus degree model and group s difference coefficient(GDC),then analyzes the effect of GDC on the mediation mechanism for consensus process,and finally proposes that identifying group divergence in evaluat- ing a given alternative is the key element of this research.

Base on it, we present two kinds of concepts of non-commonity, and give the evaluation method by optimization theories and normalization, which overcomes the adverse effect of different non-commonity.