In wireless sensor networks（ WSNs）

energy of node is severely limited

which restricts lifetime of WSNs.Hierarchical routing protocol is an efficient method to prolong lifetime of WSNs.Based on these kinds of protocol

propose a routing protocol that can adjust the bandwidth automatically.The presented mechanism can not only automatically regulate bandwidth according to node residual energy and energy consumption of data transmission

but also decides whether nodes will take part in transmitting packets in network.Simulate the proposed mechanism by using Matlab

the results show that the algorithm can efficiently prolong lifetime and keep load-balance of WSNs by regulating bandwidth.