The dual-channel bandwidth allocation is studied considering estimation performance.The networked control system is modeled as a Markov jump delay one in order to reduce the influence of time delay on signal transmission.The dual-channel transmission strategy is adopted to improve the data arrival rate and reduce the packet loss.The limited bandwidth is flexibly allocated to two channels to fully exploit the channel capacity.Then a dual-channel quantitative transmission scheme is proposed and a state estimator is designed.The sufficient condition is derived for the time-varying error estimation system to satisfy the H_∞ performance, and the gain matrix is given for the estimator.Finally, the effectiveness of the proposed strategy is illustrated by a numeral example.