A method for realizing switch-over between multiple active state AN in network includes confirming that switch-over operation is required to be carried out between multiple active state access network AN and starting up switching-over course, setting up connection of destination packet control function PCF side to packet data service network PDSN then sending data message carried with double cast indicating information simultaneously to both source PCF side and destination PCF side by PDSN and buffer-storing received data separately by both sides. |