An energy balanced coverage strategy based on particle swarm optimization（ PSO） is proposed.Residual energy of the node is considerd

the particle position update disturbance factor

is introduced and improves the network coverage rate and balance energy consumption by optimizing the communication distance between nodes. At the same time

because the algorithm is easy to fall into the local optimal solution problem after the iteration

the cosine dynamic adjustment inertia weight is proposed to increase the global search time in the initial iteration and the local search time in the later iteration. The simulation results show that the coverage strategy can improve the network coverage rate and balance the energy consumption in the network very well.