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Aggregated multicast is the main method to solve the problem of lacking labels in MPLS network. Achieving the aggregation of multicast tree must have an effective multicast group-tree matching algorithm. Which problem of the group-tree matching algorithm solves is that the multicast group can match the multicast tree perfectly. We analyze the previous multicast group-tree matching algorithm, and summarize the strengths and the weaknesses of the previous algorithm. At the same time, we propose a new group-tree matching algorithm which is the maximum matching group-tree algorithm based on forwarding tag, here referred to as FT-GTA. It is proposed based on the analysis and the summary of the previous group-tree matching algorithm. The FT-GTA algorithm can realize the multicast trees merging in the presence of saving the network bandwidth resources. Due to the dynamic of Multicast, the FT-GTA algorithm can refresh the forwarding table quickly and consequently improves the forwarding efficiency in the network. Finally, we prove that the validity of the FT-GTA algorithm by simulation.