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A delay-dependent sliding mode control algorithm for the networked control system (NCS) with mismatched uncertainties and stochastic less delay is studied. Considering stochastic less delay of the NCS, delay estimation online is present. The delay iterative measuring and pretest parameters-based estimation methods are adopted. Loop delay estimation online is designed to overcome the adverse influence caused by time-varying delay. Considering mismatched uncertainties, an asymptotically stable sliding mode surface is designed by means of linear matrix inequality (LMI). The sufficient condition for the existence of sliding surface if gained by using LMI with delay depending. A discrete sliding mode control strategy based on the loop delay of estimation and the asymptotically stable sliding mode surface is present. The simulation experiment results show the effectiveness of the algorithm.