A late call forwarding method, characterized by in an internet protocol multimedia subsystem centralized service, ICS, comprising the following steps of: A1, during a call setting up, an internet protocol multimedia subsystem circuit switch control function, ICCF, receiving (201, 301) a call request from a call session control function, CSCF, serving a called user which is registered in a Circuit Switching, CS, domain, the call being referred to as session A; the ICCF acquiring (202, 302) a called user's roaming number and initiating a call, being referred to as session B, to the called user; A2, after receiving a call request of the session B, a visited mobile switch center, VMSC, serving the called user determining that a status of the called user satisfies conditions for triggering late call forwarding and the called user subscribes a late call forwarding service in the CS domain and the VSMC has the calling customized application for mobile network enhanced logic, CAMEL, service data for the called user, then triggering the late call forwarding service and triggering an CAMEL service when initiating (205, 305) a call to a forwarding target; and A3: said VMSC exchanging (207, 307) CAMEL messages with said ICCF to inform said ICCF about session associated information and a forwarding reason, and when said ICCF determines that the forwarding is needed, said ICCF sending a forwarding indication to the CSCF in response to the session A or not responding to the session A depending on the forwarding reason, and said CSCF forwarding the forwarding indication to a telecom application server, TAS, and the TAS initiating a regular forwarding service according to the received forwarding indication or triggering the call forwarding when receiving no response at an expiration. A1, during a call setting up, an internet protocol multimedia subsystem circuit switch control function, ICCF, receiving (201, 301) a call request from a call session control function, CSCF, serving a called user which is registered in a Circuit Switching, CS, domain, the call being referred to as session A; the ICCF acquiring (202, 302) a called user's roaming number and initiating a call, being referred to as session B, to the called user; A2, after receiving a call request of the session B, a visited mobile switch center, VMSC, serving the called user determining that a status of the called user satisfies conditions for triggering late call forwarding and the called user subscribes a late call forwarding service in the CS domain and the VSMC has the calling customized application for mobile network enhanced logic, CAMEL, service data for the called user, then triggering the late call forwarding service and triggering an CAMEL service when initiating (205, 305) a call to a forwarding target; and A3: said VMSC exchanging (207, 307) CAMEL messages with said ICCF to inform said ICCF about session associated information and a forwarding reason, and when said ICCF determines that the forwarding is needed, said ICCF sending a forwarding indication to the CSCF in response to the session A or not responding to the session A depending on the forwarding reason, and said CSCF forwarding the forwarding indication to a telecom application server, TAS, and the TAS initiating a regular forwarding service according to the received forwarding indication or triggering the call forwarding when receiving no response at an expiration.