A service transmission method, comprising: sending (101, 201, 301, 401, 501), by a first base station, a request message to an offload base station, wherein the request message comprises at least one piece of service information, wherein the service information comprises quality of service, QoS, information of a service and first configuration information of a radio bearer, RB, the first base station is a base station that establishes a radio resource control, RRC, connection with a user terminal, the offload base station is at least one base station in base stations serving the user terminal, the request message instructs the offload base station to perform resource configuration according to the at least one piece of service information, the service information further comprises offload indication information, wherein the offload indication information comprises RB-based data offload information or packet-based data offload information, if the offload indication information comprises the RB-based data offload information, the first configuration information of the RB comprises: configuration information of a packet data convergence protocol, PDCP, layer, a radio link control, RLC, layer, a media access control, MAC, layer, and a physical layer; or if the offload indication information comprises the packet-based data offload information, the first configuration information of the RB comprises: configuration information of an RLC layer, a MAC layer, and a physical layer; receiving, by the first base station, a response message returned by the offload base station, wherein the response message comprises an identifier of the user terminal, and an indication message; the indication message comprises an identifier of a radio access bearer, RAB, corresponding to the RB whose resource configuration is accepted; and sending (102, 203, 302, 404, 502), by the first base station, a configuration message to the user terminal, wherein the configuration message comprises configuration list information of the RB and cell information of the offload base station, the configuration list information of the RB comprises: second configuration information of the RB, wherein the second configuration information of the RB comprises at least one of the following items: configuration information of a PDCP entity, configuration information of an RLC entity list, and MAC configuration information, a logical channel configuration information, and physical layer configuration information corresponding to each RLC entity in the RLC entity list. sending (101, 201, 301, 401, 501), by a first base station, a request message to an offload base station, wherein the request message comprises at least one piece of service information, wherein the service information comprises quality of service, QoS, information of a service and first configuration information of a radio bearer, RB, the first base station is a base station that establishes a radio resource control, RRC, connection with a user terminal, the offload base station is at least one base station in base stations serving the user terminal, the request message instructs the offload base station to perform resource configuration according to the at least one piece of service information, the service information further comprises offload indication information, wherein the offload indication information comprises RB-based data offload information or packet-based data offload information, if the offload indication information comprises the RB-based data offload information, the first configuration information of the RB comprises: configuration information of a packet data convergence protocol, PDCP, layer, a radio link control, RLC, layer, a media access control, MAC, layer, and a physical layer; or if the offload indication information comprises the packet-based data offload information, the first configuration information of the RB comprises: configuration information of an RLC layer, a MAC layer, and a physical layer; receiving, by the first base station, a response message returned by the offload base station, wherein the response message comprises an identifier of the user terminal, and an indication message; the indication message comprises an identifier of a radio access bearer, RAB, corresponding to the RB whose resource configuration is accepted; and sending (102, 203, 302, 404, 502), by the first base station, a configuration message to the user terminal, wherein the configuration message comprises configuration list information of the RB and cell information of the offload base station, the configuration list information of the RB comprises: second configuration information of the RB, wherein the second configuration information of the RB comprises at least one of the following items: configuration information of a PDCP entity, configuration information of an RLC entity list, and MAC configuration information, a logical channel configuration information, and physical layer configuration information corresponding to each RLC entity in the RLC entity list.