Abstract:This paper proposed an innovation cooperation game model in the enterprises networks based on the modified Nooteboom model. We analyzed the risk dominant equilibrium of the game model and obtained the threshold of the partner number in the enterprises networks. Furthermore, we simulated the evolutionary dynamic of the enterprises innovation cooperation networks and learned the rules of their topology properties based on the theory of complex network. The results indicated that the thresholds of the partner number in the enterprises networks were depended on the benefits, costs and risks of innovation cooperation. When the numbers of enterprises’ partners is smaller than the threshold, the cooperation rates will increase and the characteristic path lengths will shorten and the cluster degrees will decrease. When the numbers of enterprises’ partners is equal to the threshold, the cooperation rates will reach the maximum and tend to stability. When the numbers of enterprises’ partners is larger than the threshold, the cooperation rate will decrease.