Embodiments of the present invention disclose a method for migrating a user plane from an Iur-g interface to an A interface and an apparatus. The method includes: receiving, by a BSC, a migration commit notification that is sent by an RNC through an Iur-g interface, where the migration commit notification is sent by the RNC according to a notification message of finishing preparing resources by the BSC, and the notification message of finishing preparing resources by the BSC is sent by a core network; and migrating, by the BSC, a user plane from the Iur-g interface to an A interface according to the migration commit notification. In this way, the interruption duration in a process of migrating the user plane from the Iur-g interface to the A interface may be shortened.