The dispersion of the wireless sensor networks（ WSNs） node deployment

as well as own resources limitation of node require the WSNs routing algorithm must meet design principles of low cost and low power consumption. Various WSNs routing algorithms including Cluster-Tree

AODV

LEACH and RPL

are compared and analyzed. Using transmission distance between nodes and residual energy of node as unit of measurement

RPL algorithm is improved by using energy balance strategy. In cooja simulation environment

the network with different number of nodes is constructed

and the improved routing algorithm is used for simulation and test

which proves that this routing algorithm can prolong the life cycle of the network.