A method for relay transmission, comprising: Transmitting (S210), by a relay terminal device, a bearer setup request to a core network equipment, the bearer setup request being configured to request setup of an Evolved Packet System, EPS, bearer for a remote terminal device; and receiving, by the relay terminal device, a reconfiguration message sent by an access network equipment, the reconfiguration message carrying configuration information of the EPS bearer set up for the remote terminal device, wherein the EPS bearer comprises a cellular data transmission channel between the access network equipment and the relay terminal device and a Device-to-Device, D2D, data transmission channel between the relay terminal device and the remote terminal device, characterized in that the configuration information of the EPS bearer comprises configuration information of a cellular communication interface between the relay terminal device and the access network equipment and configuration information of a D2D communication interface between the relay terminal device and the remote terminal device; the configuration information of the cellular communication interface is specifically first configuration information of a physical layer, and the configuration information of the D2D communication interface is specifically second configuration information of the physical layer; or the configuration information of the cellular communication interface is specifically first configuration information of a physical layer and first configuration information of a Layer 2, and the configuration information of the D2D communication interface is specifically at least one of second configuration information of the physical layer or second configuration information of the Layer 2. Transmitting (S210), by a relay terminal device, a bearer setup request to a core network equipment, the bearer setup request being configured to request setup of an Evolved Packet System, EPS, bearer for a remote terminal device; and receiving, by the relay terminal device, a reconfiguration message sent by an access network equipment, the reconfiguration message carrying configuration information of the EPS bearer set up for the remote terminal device, wherein the EPS bearer comprises a cellular data transmission channel between the access network equipment and the relay terminal device and a Device-to-Device, D2D, data transmission channel between the relay terminal device and the remote terminal device, characterized in that the configuration information of the EPS bearer comprises configuration information of a cellular communication interface between the relay terminal device and the access network equipment and configuration information of a D2D communication interface between the relay terminal device and the remote terminal device; the configuration information of the cellular communication interface is specifically first configuration information of a physical layer, and the configuration information of the D2D communication interface is specifically second configuration information of the physical layer; or the configuration information of the cellular communication interface is specifically first configuration information of a physical layer and first configuration information of a Layer 2, and the configuration information of the D2D communication interface is specifically at least one of second configuration information of the physical layer or second configuration information of the Layer 2. <EOS>