Embodiments of the present invention provide a method and a system for implementing multicast using a slave block in DSL access technique. Several slave blocks are cascaded with a master block accessed to the DSL. The master block and slave block are respectively connected with DSL users via RTUs, and access an uplink via a network interface of the master block. The slave block is configured to make the master block and slave block support the IGMP proxy or the IGMP snooping with the master block and slave block both capable of implementing multicast function independently. The configuration data of the master block and slave block may be both saved in the master block, and a multicast channel and a unicast channel are provided between the master block and slave block for communication. This invention overcomes the shortcomings including the heavy burden on the master block, low efficiency and serious waste in bandwidth resulting from the fact that the operation of the slave block multicast member is implemented in the master block, thus increasing the efficiency of multicast and saving bandwidth of the master block.
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