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Fault detection problem of networked control systems with network-induced delay, data packets dropout and disturbance in sensor-to-controller link is discussed. First, we design an observer-based residual generator, and model the residual dynamics to be a discrete-time markovian jump linear system in this paper. By using H∞ optimization theory and linear matrix in-equation approach, the solution of alarm threshold is proposed. Then we introduce a new index to design a fault detection filter, which improves the performance of dynamic system, the sensitivity of the detection system to the fault. The approach of solving suitable observer gain matrix is proposed. At last, a numerical example is given to verify the effect of the method presented in this paper.