维护多播信息需要额外的硬件开销，多播体系结构缺乏可扩展性，限制了多播业务的发展。本文在多播中应用MPLS最小冲突路径算法，在分支节点的MPLS中加入多播信息表，实现基于源树的多播树构建，从而解决了MPLS多播中数据转发的标签分配问题，具有良好的扩展性。实验表明，利用MPLS最小冲突路径算法，起到了节约带宽和提高多播性能的作用。

Maintaining multicast information needs additional hardware overhead, and making the multicast architecture lacks scalability, thus limiting the development of multicast services. This paper applies a least interference path algorithm for MPLS in the multicast, adds multicast information table in the branch nodes MPLS, and implements the sourcetree multicast over MPLS, so  it is able to solve the difficulties of label distribution on data transmission in the MPLS multicast to achieve a good scalability. The simulation result demonstrates that the application of the least Interference path algorithm over MPLS saves bandwidth and improves multicast capability.