All routing protocols are focused on how to transfer data more efficiently from the source to the destination. But various circumstances have diverse requirements, so the method adopts to achieve this is different. In this paper, we introduce the situation of AODV running in the AMI smart-meter reallity environment and point out the bottleneck of throughput as the networks grow larger. Then, “expected transmission count” metric is presented, which has been proven in other classic routing protocol for high-throughput improvement. After analysing the applicability of ETX metric with AODV, we describe the new AODV with four major changes listed as follow: router table, hello message, neighbor-node table and something related RREQ, RREP, RERR messages. Finally, we compare the results with the traditional AODV. Simulation results in NS-2 show AODV-ETX has better throughput than the traditional one.