In order to solve the qos constrained multicast routing in mpls network , including bandwidth , delay , delay jitter , loss rate and cost , we construct a globally optimizing ant algorithm . based on the ant algorithm and qos , we study and develop an algorithm which can repair the multicast routing tree when the network multicast links fail . this algorithm can make traffic rerouting , recover network from failure and improve the ability of resilience 本文探讨了在mpls网络中，使用蚂蚁算法解决了包含带宽、延时、延时抖动、包丢失率和最小网络费用等约束条件在内的服务质量组播路由问题；并且在考虑服务质量的基础上，研究并设计了在网络出现链路故障之后，对组播路由树进行补救的算法，使得网络的业务流可以重路由，网络故障得到恢复，提高了网络的恢复力。
