Knowledge production is a source of technological innovation and economic structural adjustment in China. In this paper, we consider the heterogeneity of preferences and ability about knowledge production members. First we reveal the essential characteristics of rational expectations of knowledge producers' reciprocal preferences. Then we analyze the mechanism of mutual cooperation under the circumstances of direct reciprocity, indirect reciprocity and strong reciprocity by constructing evolutionary game model. And then we investigate the seven internal economic factors which influence knowledge cooperation team and their role in the mechanism of evolutionary equilibrium. Finally we draw a conclusion that the clear intellectual property rights are the external system which can promote mutually beneficial cooperation in knowledge work teams.