In this paper, a virtual force coverage enhancement algorithm based on node energy balance is proposed. Through the virtual force between node and node and the target region between mobile node positions, nodes in the network finally a rational distribution and uniform, and improve the network coverage performance, with a minimum of sensor nodes to maximize the coverage area. Reducing the monitoring blind area had in wireless sensor networks, reducing the cost of the network. Finally, the feasibility of the algorithm is verified by the experimental data.