The present invention discloses a method and a system for implementing an MRBT service, comprising: Step S102, a calling terminal initiates a call to a called terminal which has registered a multimedia MRBT service, and triggers an MRBT service module of the MRBT Application Server according to service template information subscribed in a Home Subscriber Server by the called terminal; Step S104, the MRBT service module calls the called terminal through an IMS network, and performs query on an MRBT platform according to the call related information to obtain the MRBT information to be played for the calling terminal; and Step S106, the calling terminal performs negotiation with the MRBT platform and performs negotiation with the called terminal, and the MRBT platform plays the MRBT information inquired by the MRBT service module according to the call related information to the calling terminal on condition that the negotiations are successful. In this way, the problem in the relative art that the MRBT service can not be implemented in the IMS network is solved.