Nowadays

many multicast QoS muting algorithms have low success ratio of muting when receivers' QoS require-menu are strict. This paper proposes a new bandwidth and delay-constrained distributed multicast muting called QDMR(QoS-based Distributed Multicast Routing).QDMR uses RBMF(Reverse Best Metzic Forwarding) instead of RPF(Reverse Path Forwarding) in seletting path to in-tree muters. Query message is forwarded if and only if it travels from a path whose reverse mute is a RBMP(Reverse Best Metric Path)from a new receiver to the current node.If RBMPs satisfy the new receivers' QoS requirements

one of them with the smallest hop counts to the multicast tree will be selected as the branch connected to the existing multicast tree. At the end

simulation shows that QDMR improves success ratio of muting reasonably and reduces protocol overheads meanwhile.