The embodiment of the invention discloses a method, a device and a system thereof for migrating a VRF, wherein the system comprises: a first BGP progress which is used for sending the VRF and configuration information of a BGP Peer in the VRF to a second BGP progress and notifying a TCP to warmly backup a TCP link correlative with Peer session of the BGP Peer in the VRF to the second GGP process; and the second BGP progress which is used for creating a virtual VRF for storing the configuration information and a virtual BGP Peer, and receiving the TCP link which is correlative with the Peer session of the BGP Peer in the VRF and is backuped to the second GGP process by the TCP and a route of Adj-RIB-IN corresponding to the BGP Peer in the VRF sent by the first BGP progress. With the embodiment of the invention, in the process of dynamic migration between the VRF and the BGP progresses, the BGP Peer service of the VRF is not interrupted and the conversation is not disconnected; and an opposite end device cannot perceive the migration process of a router at all, and route change information generated in the migration process is updated after the migration.