A method for establishing a backhaul link, wherein the method is used for a first base station and comprises: performing interaction with a relay node, so as to establish at least one connection between the first base station and the relay node, wherein the relay node comprises a first user equipment part and a second user equipment part, and the at least one connection comprises a connection between the first base station and the first user equipment part; sending a first connection establishment indication to the relay node by using the at least one connection between the first base station and the relay node, and sending a second connection establishment indication to a second base station by using an original connection between the first base station and the second base station, wherein the first connection establishment indication and the second connection establishment indication are separately used for instructing the relay node to perform interaction with the second base station, so as to establish a connection between the second user equipment part and the second base station, and the second base station switches the connection between the second user equipment part and the second base station over to a backhaul link between the second user equipment part and the second base station; and switching the connection between the first base station and the first user equipment part over to a backhaul link between the first base station and the first user equipment part, wherein the backhaul link between the first base station and the first user equipment part and the backhaul link between the second base station and the second user equipment part carry backhaul link data including S1 and/or X2 data. performing interaction with a relay node, so as to establish at least one connection between the first base station and the relay node, wherein the relay node comprises a first user equipment part and a second user equipment part, and the at least one connection comprises a connection between the first base station and the first user equipment part; sending a first connection establishment indication to the relay node by using the at least one connection between the first base station and the relay node, and sending a second connection establishment indication to a second base station by using an original connection between the first base station and the second base station, wherein the first connection establishment indication and the second connection establishment indication are separately used for instructing the relay node to perform interaction with the second base station, so as to establish a connection between the second user equipment part and the second base station, and the second base station switches the connection between the second user equipment part and the second base station over to a backhaul link between the second user equipment part and the second base station; and switching the connection between the first base station and the first user equipment part over to a backhaul link between the first base station and the first user equipment part, wherein the backhaul link between the first base station and the first user equipment part and the backhaul link between the second base station and the second user equipment part carry backhaul link data including S1 and/or X2 data.