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Efficient allocation of resources plays a vital role in cooperative communications. Based on the multiple distributed amplify-and forward relays network model, this paper proposes a relay node selection method and game theory-based power control scheme. Mathematical analysis proves the existence of Nash equilibrium. The proposed methods take both the relay node selection and power allocation into account. Simulation results show that the methods have low complexity and fast convergence. With power control according to the channel sate information (CSI), power assumption of both the source and relay can be effectively reduced while increasing the capacity of the destination node.