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This paper further analyzes the energy consumption model of the LEACH protocol, and proposes a routing algorithm for wireless sensor networks based on energy balance. It uses a more reasonable clustering method; thereby it can further balance energy consumption of the network. In this algorithm the cluster head periodically compute the residual energy of all of members in each work cycle. It takes into full account the residual energy of nodes to determine the route. It chooses an appropriate route under the premise that transmission efficiency and network energy consumption are balanced. Simulation experiments results show that the routing algorithm based on energy balance proposed by this paper can balance the relationship of routing and energy consumption, and can prolong the network lifetime.