The invention relates to the field of network communications technology, and in particular to a method and a system for multicast control and processing, and broadband access equipment for reducing the possibility that an instant processing performance bottleneck happens to the broadband access equipment. In the invention, when the broadband access equipment has no load or the load hereof is under a first threshold value, the broadband access equipment creates in advance a member table for a multicast group without any members, and requests a multicast router for obtaining multicast streams of the multicast group; and when an user terminal requests the broadband access equipment for joining the multicast group, the broadband access equipment adds the information of the user corresponding to the user terminal into the previously created member table of the multicast group, and sends the user terminal the multicast streams of the multicast group obtained by sending the advance request. By using the technical proposal of the invention, the possibility that an instant processing performance bottleneck happens to the broadband access equipment can be lowered.