Abstract: A dynamic strategy is proposed to realize the bandwidth allocation management in networked control systems in this paper.The concrete way is that the state space model of each device is obtained in networked control system.Then, the extended state space model is obtained by the dynamic analysis of the state space model parameters, together with the state variable with the dynamic of the bandwidth allocation for each control loop.In the end, each control loop can use the bandwidth according to its local dynamic and the control performance for the whole network is optimized by the appropriate adaptive control rule.The simulation results through the ball & beam process show that the proposed dynamic bandwidth allocation algorithm not only increase the bandwidth utilization, but also improve the control performance of the whole network with respect to the static traditionally bandwidth allocation algorithm.