In wireless sensor networks

many jump clustering routing protocol is used mostly fixed boundary layer model.Layer boundary fixed model makes the node of the cluster head optional quantity is limited

so will restrict the network life time.This paper PMRC (Progress Multi-hop Rotational Clustered) fixed layer boundary model for network life limit

this paper puts forward a DBL (Dynamic boundary layer) model

that is

the Dynamic changes of boundary layer model

this model can be used to Dynamic change of adjacent layer boundary structure

to balance the same layer cluster head of energy consumption.Through the simulation results show that this method can well realize the effective use of energy

and make the network survival time prolonged.