By this way, we consider the profit from member interation and the profit from the group.And four basic behavior strategys are analized.We study the supporter network in different groups .

• Stewart等模拟群体成员行为互动的模型基础上，提出了基础效用、互动效用的概念，建立了正式群体中反映成员交往互动过程中所带来的收益以及从群体本身获得收益的群体效用模型，考虑了成员行为互动的四种基本策略。