The work of Wireless Sensor Networks(WSNs) depends on reliable coverage of the area to be monitored. The problem of coverage holes arises when one or more nodes fail due to energy depletion or harsh physical environments. Therefore, Fuzzy Inference Systems(FIS)-repair node Selected(FISS) algorithm is proposed in this paper. FISS algorithm adaptively adjusts the sensing radius of node, and covers hole by moving nodes. The residual energy and coverage overlap rate of the nodes are taken as the input of FIS, and the output of FIS is to be the weight of the repair node. The node with the maximum weight is selected as the repair node. At the same time, according to the network conditions of the repair nodes, the movement direction and distance of the repair nodes are estimated. Finally, the repair of the covered void area is finally realized. Simulation results show that the proposed approach outperforms others in terms of coverage and energy consumption.