The traditional decision2making problem of enterprises is expanded to non2cooperation game with profit conflict condition , then to group negotiation problem. It is how to cooperate with each other while their non2coopera2 tion profit not being cut down. The Pareto goal function is proposed. For the sake of coalition’s stability , this paper give the concept of believable threat and the measuring method. Based on the believable threat , the alliance dis2 burses the Pareto value. Finally a three2company group negotiation case is given and the efficiency of the proposed model is shown.