Recent advances in wireless sensor networks have led to many new routing protocols specifically designed for sensor networks. Due to the nodes equip limited energy and secondary supply is difficult, during the design of cluster-routing protocol not only considering the energy of nodes but also reduced the energy consumption of whole WSN as much as possible .On the basis of understanding of routing protocol, author analyzed its characteristics and shortcoming. This paper proposes a new cluster-routing protocol. The new protocol balanced energy depletion of node by three methods: Considering the energy of nodes when selecting cluster heads, limited number of nodes in each cluster and sends the data to the base station by means of improved multi-hop routing. From the three methods reduce the energy consumption of nodes and balances the energy consumption among clusters. Simulation results show that the new protocol reduced energy consumption of WSN and obvious improvement on the network lifetime.