Abstract: The paper design a new energy efficient uneven clustering routing protocols-UCRP. Dividing the network into some clusters of different size according to the distance from base station; the protocol transmits data using one-hop or multi-hop at intra-cluster; and constructs the multi-hop routing among inter-clusters, the cluster head select it′s next hop node combining th eenergy of node with the minimum-hop routing algorithm; finally, under the premise of the energy efficient the paper put forward security idea based on the LEACH protocol is easily attacked by HELLO flooding. Simulation results show that the routing protocol effectively balances the energy consumption of cluster heads and the whole network, prolongs the network lifetim.