Abstract: Trust recommended behaviors rely on the cooperation among nodes in wireless ad hoc network and trust system itself cannot provide trust evaluations for the behaviors. We proposed a repeated probability game to facilitate the study of the interaction process for trust-recommended behaviors between nodes. Based on the model, we analyzed the INFLUENCE of the four types of incentive strategics, namely TFT,GTFT,OT,GT to motivate the trust-recommended behavior between nodes, as well as the DIFFERENCE of the ectuilibrium boundary conditions of the four incentives strategics. Simulation results show that, in the high rate of sudden selfish behaviors, GTFT strategy keeps Efficient Recommendation Ratio at a higher level,motivates the cooperation of trust recommended behaviors and then helps the trust system to make timely and accurate trust evaluations in the case of collusion attacks.

Key words: Probability game, Wireless ad hoc network, Trust recommendation, Collusion attack