With the development of the power internet of things, the distribution network is facing great challenges. As the end of the power system, it directly faces a large number of actual power users, and its customer experience satisfaction and power supply operation reliability have attracted much attention. In LoRa Wide Area Network(LoraWAN), a LoRa gateway based optimization algorithm is proposed for wireless relay, which is associated with HDAF to reduce the signal error transmission and power consumption as the nodes speed increases. In this strategy, gateway is treatedas relay and the distance of the employed nodes is manipulated by symbol error rate(SER), and the transmission power of all nodes is minimized according to the extreme conditionsof Karush-Kuhn-Tucker(KKT). Numerical results show that the SER can be effectively reduced compared with the forward strategies of amplify-and-forward(AF) and decode-and-forward(DF). Moreover, the power consumption of the communication networkemploying our proposed strategy will be less than AF and DF in the distribution network.