The present invention provides a location change reporting method, device, and system, to resolve at least an existing problem that a session management function entity cannot decide how to report a location change event of UE in a PRAto a subscription entity because the location change event of the UE in the PRA that is reported by a mobility management entity carries only an ID(s) of the PRA when an ID of the PRA set is used to subscribe to the location change event of the UE in the PRA in a multi-PRA scenario. The method includes: receiving, by a session management function entity, location change information of UE in a PRA, an identity of the PRA, and an identity of a PRA set to which the PRA corresponding to the identity of the PRA belongs that are sent by a mobility management entity; determining, by the session management function entity based on the identity of the PRA set and stored PRA subscription information, a subscription entity that subscribes to a location change event of the UE in any PRA in the PRA set; and sending, by the session management function entity, the identity of the PRA and the location change information of the UE in the PRA to the subscription entity. The present invention is applicable to the field of communications technologies.