A method for setting up a Radio Bearer, RB, the method performed by a Relay Station comprising: receiving (11, 34, 42) a first RB setup message sent by an evolved NodeB, eNB, wherein, when on a relay link there is no RB that bears a same service as an RB which is set up according to a service request initiated by a User Equipment, UE, the first RB setup message comprises a request for setting up the RB for the UE and resources allocated to the UE, and the number of the UE is at least one; wherein, when on the relay link there is an RB that bearers the same service as the RB which is set up according to the service request initiated by the UE, the first RB setup message is a combined RB setup reconfiguration message, the combined RB setup reconfiguration message carries configuration parameters of the RB on the relay link and the configuration parameters need to be modified; performing (12, 35, 43) RB setup preprocessing according to the first RB setup message, wherein, when on the relay link there is an RB that bearers the same service as the RB which is set up according to the service request initiated by the UE, the performing RB setup preprocessing according to the first RB setup message comprises: modifying the configuration parameters of the RB on the relay link according to the combined RB setup reconfiguration message and updating a mapping table between the RB on the relay link and the RB on the access link, wherein the mapping table is created when the RB on the relay link is set up; generating (13, 36, 44) a second RB setup message according to a result of the RB setup preprocessing; and sending (14, 38, 46) the second RB setup message to the UE, notifying the UE to set up an RB on an access link; wherein, when the first RB setup message comprises the request for setting up an RB for the UE, the performing RB setup preprocessing according to the first RB setup message comprises: setting up an RB on the relay link with the eNB; and creating a mapping table between the RB on the relay link and the RB on the access link according to information carried in the first RB setup message. receiving (11, 34, 42) a first RB setup message sent by an evolved NodeB, eNB, wherein, when on a relay link there is no RB that bears a same service as an RB which is set up according to a service request initiated by a User Equipment, UE, the first RB setup message comprises a request for setting up the RB for the UE and resources allocated to the UE, and the number of the UE is at least one; wherein, when on the relay link there is an RB that bearers the same service as the RB which is set up according to the service request initiated by the UE, the first RB setup message is a combined RB setup reconfiguration message, the combined RB setup reconfiguration message carries configuration parameters of the RB on the relay link and the configuration parameters need to be modified; performing (12, 35, 43) RB setup preprocessing according to the first RB setup message, wherein, when on the relay link there is an RB that bearers the same service as the RB which is set up according to the service request initiated by the UE, the performing RB setup preprocessing according to the first RB setup message comprises: modifying the configuration parameters of the RB on the relay link according to the combined RB setup reconfiguration message and updating a mapping table between the RB on the relay link and the RB on the access link, wherein the mapping table is created when the RB on the relay link is set up; generating (13, 36, 44) a second RB setup message according to a result of the RB setup preprocessing; and sending (14, 38, 46) the second RB setup message to the UE, notifying the UE to set up an RB on an access link; wherein, when the first RB setup message comprises the request for setting up an RB for the UE, the performing RB setup preprocessing according to the first RB setup message comprises: setting up an RB on the relay link with the eNB; and creating a mapping table between the RB on the relay link and the RB on the access link according to information carried in the first RB setup message. setting up an RB on the relay link with the eNB; and creating a mapping table between the RB on the relay link and the RB on the access link according to information carried in the first RB setup message.