A method for transmitting a Sounding Reference Signal, SRS, the method comprising: deciding whether to transmit an SRS, according to whether transmission frequency resources of the SRS overlap with a narrowband for transmitting data; wherein the deciding whether to transmit an SRS, according to whether transmission frequency resources of the SRS overlap with a narrowband for transmitting data, comprises one of followings: in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting uplink data only partially, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting an uplink data only partially, and there are uplink data transmitted in the SRS sub-frame, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; the method further comprising: transmitting the SRS on the SRS sub-frame according to the decision. deciding whether to transmit an SRS, according to whether transmission frequency resources of the SRS overlap with a narrowband for transmitting data; wherein the deciding whether to transmit an SRS, according to whether transmission frequency resources of the SRS overlap with a narrowband for transmitting data, comprises one of followings: in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting uplink data only partially, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting an uplink data only partially, and there are uplink data transmitted in the SRS sub-frame, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; the method further comprising: transmitting the SRS on the SRS sub-frame according to the decision. in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting uplink data only partially, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; in the SRS sub-frame, if transmission frequency resources of the SRS overlap with the narrowband for transmitting an uplink data only partially, and there are uplink data transmitted in the SRS sub-frame, then deciding not to transmit the SRS over frequency resources, which do not overlap with the narrowband for transmitting uplink data, and to transmit the SRS over frequency resources, which do overlap with the narrowband for transmitting uplink data, among the transmission frequency resources of the SRS; the method further comprising: transmitting the SRS on the SRS sub-frame according to the decision.