Abstract: NCS is network-based distributed control system.Combined with network scheduling and system control,a optimized performance model of NCS under the condition of network schedulability and(system) stability was proposed in this paper.Simuliation was made with real-time simulation software(packet) TrueTime based on Matlab/Simulink.The simulation results showed that the method not only(enhanced) the(performance) of the control system,but also optimized the network scheduling and improved the network efficiency.