Abstract: The energy of sensor node is limited in wireless sensor networks,in order to improve the energy efficiency,the paper designs a new energy efficient clustering routing algorithm EERA based on the disadvantages,such as randomly selected the cluster head,the cluster structure is unreasonable. The EERA uses the new algorithm for selecting cluster head,forming cluster and building inter-cluster routing,based on the residual energy and the relative positions of nodes to select cluster head and form cluster can make the nodes of more energy become cluster head and also make cluster heads homogeneously distributed in the network region; according to the minimum-hop routing algorithm and improved MTE to construct the inter-cluster routing can form a minimum-hop and minimum energy path. Simulation results show that the routing algorithm effectively balances the energy consumption and prolongs the network lifetime.