The invention discloses a method for accessing multimedia broadcast multicast service, which comprises that: firstly, an eBM-SC transmits session starting requirement information to an MBMS2, wherein the information carries address lists, secondly, the MBMS2 allocates the multicast data channel address, transmits the conversion starting requirement information of the MBMS to nodes in the SGSN address list, transmits the conversion starting requirement information of the EMBMS which carries the multicast data channel address to the nodes in the MBMS1 address list. The MBMS2 in the invention can rapidly judge which is the SGSN and which is MBMS1 according to the SGSN address list and the MBMS1 address list which are carried by the session starting requirement information, then transmits thesession starting information of the EMBMS to the MBMS1 based on the SAE, and transmits the session starting information of the MBMS to the SGSN based on the GPRS/UMTS, which simplifies the flow path and improves the availability ratio of the network sources.