分布式排队双总线（ＤＱＤＢ）协议采用带宽平衡机制（ＢＷＢ），保证了在网络重载时，在每个结点浪费掉一部分带宽的条件下，达到全网带宽分配的公平性．但它还存在着优先级管理和达到公平性稳态的时间较长等问题．在分析造成这些问题的原因的基础上，提出了一种更为有效地解决带宽分配公平性的方法，即具有时隙重用功能和抢占优先功能的、多请求多优先级ＢＷＢ计数器的媒质接入控制机制（Ｍ－ＤＱＤＢ）．这种新方法在保持原协议特点的同时，进一步改善了网络带宽分配的性能 Distributed queuing dual-bus (DQDB) protocol uses the bandwidth balancing mechanism (BWB) to guarantee the fairness of bandwidth allocation across the entire network under the condition that each node is wasted a part of the bandwidth when the network is overloaded. But it still has the problems of priority management and longer time to reach a fair and steady state. Based on the analysis of the causes of these problems, a more efficient method to solve the fairness of bandwidth allocation is presented, that is, the medium access of multi-request multiple-priority BWB counters with time-slot reuse function and preemption priority function Control Mechanism (M-DQDB). This new method further improves the performance of network bandwidth allocation while maintaining the original protocol features