A method, a terminal, and a system for implementing call diversion. The method comprises: when a call access anomaly of a request terminal occurs, setting and sending call forwarding request information to a target terminal; the target terminal reading a call forwarding identification in the call forwarding request information, determining whether the call forwarding identification is correct, and if yes, reading an address of the target terminal in the call forwarding request information; the target terminal determining whether the address of the target terminal is correct, and if yes, reading a forwarding address identification in the call forwarding request information, setting a forwarding terminal address according to the forwarding address identification, and setting and sending call forwarding success response information to the request terminal; and the request terminal receiving the call forwarding success response information and setting up call forwarding.