Abstract: The lack of cooperation among the nodes of a network may seriously affect the network functions.In order to solve the problem，a repeated game framework，which optimizes packet forwarding probabilities of distributed nodes by detecting and responding the selfish behavior，is proposed.By the repeated game among nodes and broadcasting the monitored nodes’utility change，the framework could detect the selfish behavior in the network in time.A punishing mechanism which prevents the selfish nodes’ deviation from cooperation is provided.The simulation results show that with the punishment mechanism in the model，selfish nodes can be forced to participate to the network operation and maintain the connectivity of network.