The unbalanced load among sensors in wireless sensor networks is caused by many-to-one way of data transmission.The nodes near Sink will spend more energy than those far away from Sink

and then the energy hole is caused in sensor networks.According the paths of data transmission and the nodes undertaking the different number of paths

the energy consumption of different layers node is balanced.The non-uniform sensor deployment strategy

which number of routing node in an inner is equal to number of sensing node in outer tiers farther away from Sink

while the fraction of coverge of sensing node in all the coverage area is the same

is presented.The simulation results show that the non-uniform sensor deployment strategy is feasible.