Aiming at shortcomings of low coverage rate of wireless sensor networks（WSNs） nodes while randomly deployed at present

a combination mehtod of centroidal voronoi tessellation（CVT） model and circle coverage are proposed.The problem of network coverage optimization is transformed to the optimization problem of each WSNs node coverages corresponding to Voronoi polygon region to reduce the complexity of the problem

which not only makes the node deployment and regional division of WSNs more reasonable

but also makes the network coverage range better.The experimental results show that the model can effectively improve the network coverage of WSNs

and provide better network communication service.