In a large-scale wireless sensor network

the unbalance of node density causes the different distribution of energy resource.So the distribution of energy consumes will has a great effect on the lifespan of the networks.From the point of energy density instead of node energy

a routing algorithm based on energy density and adjustable transmission power is proposed.It is aimed to increase the frequency of data transmission for the high energy density nodes

and to save the energy of the low energy density nodes with an adjustable transmission power technique at the same time.The simulated tests show that the routing algorithm can effectively extend the networks’lifetime because of the optimized distribution of energy consumes in the network.