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Time-delay of message-transmission in the network is one of the main causes for bad control performance in multi-processor networked control system (NCS). Improved mixed traffic scheduler can shorten deadline of message-transmission and cut much time-delay by increasing number 1 of sampling. In the meantime, feedback scheduling control model for NCS can schedule instantly message-transmission and always keep reasonable leisure-time by regulating the basic sampling-period of NCS. As a result, the congestion and time-delay for message in the network were decreased, and an utilization rate for network was raised. According to the simulation experiment, dynamic performance of NCS has also been greatly improved. The effect of the researches on message scheduling has been confirmed.