A domain transferring method for single radio voice call continuity, a UE accessing via a long term evolution, LTE,/system architecture evolution, SAE, network, and setting up an IP multimedia subsystem, IMS, session with a remote node and the session being anchored at a voice call continuity application server, VCC AS; after an inter working function, IWF, receives a call setup message including a VCC Domain Transfer Number, VDN, which is sent by the UE, and a handover request which is sent by the LTE/SAE network and used to transfer the session to make the session access from a circuit switched, CS, domain, the IWF controlling the LTE/SAE network and CS domain network to perform the subsequent handover operations, the method including: after the UE receives a handover command sent by the LTE/SAE network, the UE sending a handover access message and a handover completed message to a target access equipment in the CS domain (423,425), and sending the VCC AS a notification message which indicates that a handover is completed; and after the VCC AS receives the notification message which indicates that the handover is completed, the VCC AS releasing the session resources of the session from the VCC AS to the LTE/SAE network; wherein the VDN is used to indicate the VCC AS to perform a domain transferring of single radio voice call continuity; after the IWF receives the handover request sent by the LTE/SAE network, and before the session resources of the session from the VCC AS to the LTE/SAE network are released, the method also including: the IWF sending a call setup message including the VDN to a visited mobile services switch center, VMSC; after the VMSC receives the call setup message, the VMSC sending an ISDN user part, ISUP, initial address message including the VDN to a media gateway control function, MGCF; after the MGCF receives the ISUP initial address message, the MGCF setting up a session initial protocol, SIP, session with the VCC AS using the VDN; and the VCC AS learning from the VDN that it needs to releases the session resources of the session from the VCC AS to the LTE/SAE network only after receiving the notification message which indicates that the handover is completed. after the UE receives a handover command sent by the LTE/SAE network, the UE sending a handover access message and a handover completed message to a target access equipment in the CS domain (423,425), and sending the VCC AS a notification message which indicates that a handover is completed; and after the VCC AS receives the notification message which indicates that the handover is completed, the VCC AS releasing the session resources of the session from the VCC AS to the LTE/SAE network; wherein the VDN is used to indicate the VCC AS to perform a domain transferring of single radio voice call continuity; after the IWF receives the handover request sent by the LTE/SAE network, and before the session resources of the session from the VCC AS to the LTE/SAE network are released, the method also including: the IWF sending a call setup message including the VDN to a visited mobile services switch center, VMSC; after the VMSC receives the call setup message, the VMSC sending an ISDN user part, ISUP, initial address message including the VDN to a media gateway control function, MGCF; after the MGCF receives the ISUP initial address message, the MGCF setting up a session initial protocol, SIP, session with the VCC AS using the VDN; and the VCC AS learning from the VDN that it needs to releases the session resources of the session from the VCC AS to the LTE/SAE network only after receiving the notification message which indicates that the handover is completed. the IWF sending a call setup message including the VDN to a visited mobile services switch center, VMSC; after the VMSC receives the call setup message, the VMSC sending an ISDN user part, ISUP, initial address message including the VDN to a media gateway control function, MGCF; after the MGCF receives the ISUP initial address message, the MGCF setting up a session initial protocol, SIP, session with the VCC AS using the VDN; and the VCC AS learning from the VDN that it needs to releases the session resources of the session from the VCC AS to the LTE/SAE network only after receiving the notification message which indicates that the handover is completed.