A routing method, comprising: receiving, by a relay user equipment, UE, a data packet from a remote UE; and sending, by the relay UE, the data packet to a base station by layer 2 data forwarding; wherein the sending, by the relay UE, the data packet to a base station by layer 2 data forwarding comprises: including, by the relay UE, information for identifying the remote UE and a bearer to which the data packet belongs in a relay adaptation layer header of the data packet; wherein before the relay UE sends the data packet to the base station by layer 2 data forwarding, the method further comprises: acquiring, by the relay UE, information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs; wherein the relay UE acquires information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs in manner of: acquiring information for identifying the remote UE and the bearer to which the data packet belongs, wherein the information is contained in an adaptation layer header of the data packet received from the remote UE; wherein the information for identifying the remote UE and the bearer to which the data packet belongs comprises identification information of the remote UE and bearer identification information; wherein the identification information of the remote UE comprises a new-defined UE identifier, and the bearer identification information comprises a radio bearer identifier. receiving, by a relay user equipment, UE, a data packet from a remote UE; and sending, by the relay UE, the data packet to a base station by layer 2 data forwarding; wherein the sending, by the relay UE, the data packet to a base station by layer 2 data forwarding comprises: including, by the relay UE, information for identifying the remote UE and a bearer to which the data packet belongs in a relay adaptation layer header of the data packet; wherein before the relay UE sends the data packet to the base station by layer 2 data forwarding, the method further comprises: acquiring, by the relay UE, information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs; wherein the relay UE acquires information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs in manner of: acquiring information for identifying the remote UE and the bearer to which the data packet belongs, wherein the information is contained in an adaptation layer header of the data packet received from the remote UE; wherein the information for identifying the remote UE and the bearer to which the data packet belongs comprises identification information of the remote UE and bearer identification information; wherein the identification information of the remote UE comprises a new-defined UE identifier, and the bearer identification information comprises a radio bearer identifier. including, by the relay UE, information for identifying the remote UE and a bearer to which the data packet belongs in a relay adaptation layer header of the data packet; wherein before the relay UE sends the data packet to the base station by layer 2 data forwarding, the method further comprises: acquiring, by the relay UE, information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs; wherein the relay UE acquires information for identifying the remote UE to which the data packet belongs, and information for identifying a radio bearer to which the data packet belongs in manner of: acquiring information for identifying the remote UE and the bearer to which the data packet belongs, wherein the information is contained in an adaptation layer header of the data packet received from the remote UE; wherein the information for identifying the remote UE and the bearer to which the data packet belongs comprises identification information of the remote UE and bearer identification information; wherein the identification information of the remote UE comprises a new-defined UE identifier, and the bearer identification information comprises a radio bearer identifier. acquiring information for identifying the remote UE and the bearer to which the data packet belongs, wherein the information is contained in an adaptation layer header of the data packet received from the remote UE; wherein the information for identifying the remote UE and the bearer to which the data packet belongs comprises identification information of the remote UE and bearer identification information; wherein the identification information of the remote UE comprises a new-defined UE identifier, and the bearer identification information comprises a radio bearer identifier.