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Since there is no central management center in the MANETs, nodes need to self-manage service provided by other nodes. To pursue maximal utilities, they should be able to negotiate autonomously for services, e.g., packets transmission, information share. While some selfish mobile nodes in MANETs are unwilling to provide services for other users, it directly leads to serious decline in network performances. Hence an effective negotiation mechanism is required to stimulate them to cooperation. In this paper, we present a service-oriented negotiation model between selfish nodes in view of one-to-many application scenarios, driven by the basic intuition that negotiators tend to maximize their individual payoffs while ensuring that an agreement is reached. We develop the genetic algorithm to make the negotiation more adaptive in the MANETs. The simulation results show that the algorithm reduces energy consumption and communication traffic in deed.