To extend lifetime of wireless sensor networks（ WSNs）

a locally updated routing algorithm based on residual energy（ RE-RouA） is proposed. In this algorithm

the node residual energy is fused into the process of the original algorithm

in the phase of virtual sink nodes selection

the phase of data collection tree construction

the phase of routing update are improved effectively

add the selection and update conditions

and adjust node position by weighting function. Experimental result show that the improved algorithm effectively prolongs the lifecycle of WSNs on the basis of guaranteeing the network time delay unchanged

and the experimental effect is remarkable.