To solve energy consumption problem of node in wireless sensor networks（WSNs） LEACH algorithm and many of its improved algorithms are from the point of view of energy balance

but there are still defects in selection of cluster heads

the LEACH algorithm is further improved

and a topology routing algorithm using skeleton nodes as cluster head（SNACH） is proposed. The skeleton nodes are extracted as cluster heads in the network

the skeleton nodes are expanded to get a backbone network band as alternative set of cluster heads. By this way

the nodes can be distributed uniformly in the network

reducing the pressure of the cluster head nodes

and making the node reach the state of energy balance in the network.200 nodes are distributed in the area of 200×200 m and simulation experiment is carried out

the results show that when the base station（BS） node is at the origin

compared with the LEACH algorithm

the time of node death is delayed by 221 %.