The invention discloses a method for transmitting multicast-broadcast programs, which comprises the steps as follows: Step S202, the multicast-broadcast processing module of a base station controller sends a program stream data to the media surface interface board of the base station controller; Step S204, the media surface interface board of the base station controller searches for the addressesof the media surface interface board of a plurality of target base stations from a multicast-broadcast program table according to the program stream identifier after receiving the program stream data; Step S206, the media surface interface board of the base station forwards the program stream data to the media surface interface boards of various base stations; Step S208, the media surface interface board of the base station searches for the address of the IGMP group from a routing table according to the program stream identifier after receiving the program stream data sent in Step S206; Step S210, the program stream data is forwarded with the address of the IGMP group searched for in Step 208 serving as the target address; and Step S212, after a channel card receives the program stream data, a radio frequency (RF) unit of the base station sends the received program stream data to a mobile terminal through an air interface after the program stream data is coded and modulated.