The invention discloses a multicast group optimization method and an anchor point. Node sets requesting the same multicast group data and sharing the same access gateway in the multicast group are identified, and the same multicast group data are sent to each node in the node set through the same access gateway, so that the multicast data can be transferred to different nodes through the same gateway, the network side flow can be saved, and the multicast group optimization can be realized. Furthermore, in the invention, through the optimization mode of the nodes and under the condition that the nodes have multiple access interfaces, multicast routing of the node requesting the same multicast group data and sharing the same access gateway can be optimized to the same shared gateway and transferred by the anchor point, so that unnecessary multicast routing can be reduced, the scale of multicast forwarding tree can be reduced, and the resource waste of the network side can be reduced to the greatest extent.