In practical application

nodes distribution in wireless sensor networks（ WSNs） are not uniform and energy of nodes is limited. Different workload of nodes results in unbalanced energy consumption of nodes

which affects life cycle of WSNs. In order to prolong network lifecycle

a GPSR protocol for WSNs based on clustering is proposed. In this protocol

the network is divided into several clusters

each cluster needs to choose appropriate cluster head

cluster head choosing use remaining energy as index and rotate in cluster. Improved greedy algorithm is used in cluster to gather data to cluster head node

which effectively avoids problem of local minimization.Simulation results show that the protocol can prolong network lifecycle and improve success rate of data transmission.