The present invention provides a method, terminal and system for implementing a multimedia coloring ring back tone (MCRBT) service in IMS domain. This method comprises: after receiving a call from a caller, a core network setting up a connection with a MCRBT service system when the callee is called if determining that the callee subscribes the MCRBT service; said MCRBT service system triggering the MCRBT service, and sending an address of a MCRBT file set by said callee through said core network; and said caller downloading said MCRBT file from a media resource server of said MCRBT service system according to said address, and enjoying said MCRBT file from a calling terminal when a called terminal rings. The present invention can meet the requirement of the caller of enjoying the MCRBT file set by the callee when the caller calls the callee of IMS domain, and better services are provided.