A method for implementing subscription to notification, applied to a user data convergence network including a user data repository, wherein the method comprises: establishing a subscription to notification relationship in the user data repository; the subscription to notification relationship comprising a notification triggering condition which describes a condition of the user data repository sending a notification message; when receiving an update data request, if the update data request meets the notification triggering condition the user data repository sending the notification message to a notification event subscriber, wherein: content of the notification triggering condition comprises a data subscription status and a data change status, or a subscription event as well as the data change status; the data subscription status describes a subscription status of data requested by a subscription to notification event on subscription data; the data change status describes a change status of data subscribed by the subscription to notification event on the subscription data; the subscription event describes an event required to be triggered for the notification message; as long as any one of following conditions is met, the update data request meets the notification triggering condition: data is in a subscribed status and changes; the event is in the subscribed status and data related to the event changes; a message corresponding to the event carries a notification flag indicating to send the notification message. establishing a subscription to notification relationship in the user data repository; the subscription to notification relationship comprising a notification triggering condition which describes a condition of the user data repository sending a notification message; when receiving an update data request, if the update data request meets the notification triggering condition the user data repository sending the notification message to a notification event subscriber, wherein: content of the notification triggering condition comprises a data subscription status and a data change status, or a subscription event as well as the data change status; the data subscription status describes a subscription status of data requested by a subscription to notification event on subscription data; the data change status describes a change status of data subscribed by the subscription to notification event on the subscription data; the subscription event describes an event required to be triggered for the notification message; as long as any one of following conditions is met, the update data request meets the notification triggering condition: data is in a subscribed status and changes; the event is in the subscribed status and data related to the event changes; a message corresponding to the event carries a notification flag indicating to send the notification message. content of the notification triggering condition comprises a data subscription status and a data change status, or a subscription event as well as the data change status; the data subscription status describes a subscription status of data requested by a subscription to notification event on subscription data; the data change status describes a change status of data subscribed by the subscription to notification event on the subscription data; the subscription event describes an event required to be triggered for the notification message; as long as any one of following conditions is met, the update data request meets the notification triggering condition: data is in a subscribed status and changes; the event is in the subscribed status and data related to the event changes; a message corresponding to the event carries a notification flag indicating to send the notification message. data is in a subscribed status and changes; the event is in the subscribed status and data related to the event changes; a message corresponding to the event carries a notification flag indicating to send the notification message.