Abstract: In order to reduce the energy consumption of wireless multihop network, a type of cooperative routing algorithm is proposed. Compared to the conventional routing algorithm, the cooperative routing algorithm adopts a form of decode-forward and amplify-forward scheme named hybrid relaying protocol to reduce the route length. To achieve the required channel capacity from source to destination, the minimum transmitting power is deduced according to the channel state information. Finally, the routing algorithm and its implementation are proposed based on minimum power consumption. The simulation shows that the power allocation and the routing algorithm reduce the symbol error rate at the expense of low power consumption, which enhances the communication reliability and energy efficiency.