In order to optimize the energy efficiency spectrum of the double-hop amplification and forwarding cooperative multi-relay network under the incomplete channel state, a strategy of combining the relay selection scheme based on the network model with the joint optimization scheme of transmission rate and total transmission power is proposed. Specifically, in a two-hop amplifying and forwarding cooperative multi-relay network under an incomplete channel state, a relay selection method based on relay location is first designed to select the optimal relay. Then, when power optimization, combined with the classic 0-1 fractional programming problem solving algorithm-Dinkelbach method, design the rate selection algorithm when transmitting data with the minimum power in the incomplete channel state. The simulation results show that in the double-hop amplification and forwarding cooperative multi-relay network with channel estimation errors, the scheme proposed in this paper enables the network to have an optimal transmission rate. In addition, compared with the method of random relay and equal power allocation, this strategy can improve energy efficiency by nearly 22%.