In networked control systems(NCSs),a fuzzy logic modulator,which is based on mapping relationship of one-dimensional input and one-dimensional output,is designed for the dynamic management of control systems' bandwidth. By adjusting a nonlinear offset factor in the fuzzy logic modulator,the control performance and requirement of bandwidth can be further improved.Moreover,the upper and lower bound of the assignable bandwidth,which guarantee the system's stability,are evaluated in terms of linear matrix inequalities and the restrained resource conditions.Finally, normalizable criterions of the quality of control (QoC) and requirement of bandwidth (RoB) are also defined,which can estimate the performance of the whole networked control systems. On those criterions, the proposed algorithm, namely fuzzy bandwidth management (FBM) , and traditional fixed bandwidth allocation (FBA) are compared. The results of simulation highlight that the proposed algorithm can significantly improve performance and save more bandwidth of control loop than the other one.