An intelligent charging triggering method is provided. The method includes receiving a subscriber location data update request sent by a serving mobile switching center (MSC), determining whether subscriber data delivered to the serving MSC carries intelligent subscription data of a prepaid subscriber according to a preset intelligent charging triggering policy, and then delivering the subscriber data carrying the intelligent subscription data to the serving MSC if a determination result is that the subscriber data delivered to the serving MSC carries the intelligent subscription data. A home location register (HLR) and a charging processing system are further provided. The technical solutions can realize real-time charging of a calling service of a prepaid subscriber in a BOSS system when the prepaid subscriber roams in a roaming region of a home country, and meanwhile realize an international roaming service of a prepaid subscriber in an intelligent network (IN).