Abstract: The H∞ state feedback control problem of networked control systems(NCS) with losing data packet possibility is studied.The situation of losing data packet is considered in a networked control system,and the process of packet loss is modeled as a Markovian process with finite state.Based on this model,the sufficient conditions for the existence of controllers which both guarantee the mean-square stability of NCS and meet the H∞ performance are given by using Markovian jump linear system theory and linear matrix inequality technique.The corresponding design techniques of the controller are also provided.Finally,the numerical example and simulation result demonstrate the validity of the method.