Abstract: As for positive external effect of cooperation in logistics enterprises,the paper carries out analysis of it by building evolutionary game model of cooperation between key nodes logistics enterprises and non key nodes logistics enterprises. Research results show that the cooperation strategies of both key nodes logistics enterprises and non key nodes logistics enterprise are related to the increased benefits of cooperation between the two parties, when the increased benefits of the cooperation between the two parties change, some evolutionarily stable equilibrium is found; if “free rider” can gain a lot from the other side when they take cooperation strategy, logistics enterprises will reduce cooperation initiative. Therefore, logistics industry association should use macro-control to improve the overall credibility of logistics enterprises and punish the “free rider” behavior to promote the logistics enterprises to cooperate; reward logistics enterprises whose cooperation revenue growth is relatively small to motivate them to cooperate, and improve the overall credibility of logistics enterprises.

Key words: logistics enterprises, cooperation, evolutionary game, key nodes