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Network-induced delays in the networked control system are inevitable and have a significant effect on system performance. In this paper, time-varying delays are regarded as the sum of the mean delays and uncertain delays. Furthermore, NCS is modeled as a discrete-time model with structural uncertainty for its time-varying network-induced delays. Based on the model, a guaranteed cost control law is presented which can stabilize the closed loop system and guarantees an adequate level of quality of performance. Theoretical analyses and simulation results compared to standard discrete linear quadratic regulator designed for discrete-time systems show that the control strategy presented in this paper is effective and feasible.