A method for relay transmission, the method comprising: receiving, by a relay layer of a first node, target data sent by a second node, wherein the second node is an anchor node, the first node is wirelessly connected with the second node, the anchor node is wiredly connected with a core network, and a destination node of the target data is a third node; wherein the third node is a relay node directly connected with the terminal device, and processing, by the relay layer of the first node, the received target data, wherein the method further comprises: determining, by the relay layer of the first node, a processing mode of the target data according to first indication information, wherein the processing mode of the target data is: forwarding the target data to the third node, wherein the relay layer is above a Radio Link Control, RLC, layer, and below the upper layer, wherein the upper layer comprises: an Internet Protocol, IP, layer, a Packet Data Convergence Protocol, PDCP, layer, and a General Packet Radio Service Tunnel Protocol, GTP, layer, wherein the indication information is useable for indicating whether the target data is sent to the first node, whether the target data is sent to a terminal device directly connected with the first node, and whether the target data is sent to another relay node, wherein the third node is configured to perform GTP layer processing on the target data and forward the target data to the terminal device through a data bearer of the terminal device. receiving, by a relay layer of a first node, target data sent by a second node, wherein the second node is an anchor node, the first node is wirelessly connected with the second node, the anchor node is wiredly connected with a core network, and a destination node of the target data is a third node; wherein the third node is a relay node directly connected with the terminal device, and processing, by the relay layer of the first node, the received target data, wherein the method further comprises: determining, by the relay layer of the first node, a processing mode of the target data according to first indication information, wherein the processing mode of the target data is: forwarding the target data to the third node, wherein the relay layer is above a Radio Link Control, RLC, layer, and below the upper layer, wherein the upper layer comprises: an Internet Protocol, IP, layer, a Packet Data Convergence Protocol, PDCP, layer, and a General Packet Radio Service Tunnel Protocol, GTP, layer, wherein the indication information is useable for indicating whether the target data is sent to the first node, whether the target data is sent to a terminal device directly connected with the first node, and whether the target data is sent to another relay node, wherein the third node is configured to perform GTP layer processing on the target data and forward the target data to the terminal device through a data bearer of the terminal device. forwarding the target data to the third node, wherein the relay layer is above a Radio Link Control, RLC, layer, and below the upper layer, wherein the upper layer comprises: an Internet Protocol, IP, layer, a Packet Data Convergence Protocol, PDCP, layer, and a General Packet Radio Service Tunnel Protocol, GTP, layer, wherein the indication information is useable for indicating whether the target data is sent to the first node, whether the target data is sent to a terminal device directly connected with the first node, and whether the target data is sent to another relay node, wherein the third node is configured to perform GTP layer processing on the target data and forward the target data to the terminal device through a data bearer of the terminal device.