The present invention proposes a method for measuring channel state information (CSI), a method for transmitting CSI, and a device supporting the CSI. In an embodiment of the present invention, a method of feeding back channel state information (CSI) in a wireless access system includes receiving an upper layer signal including a channel quality information (CQI) index and an aperiodic CSI request field Receiving a physical downlink shared channel (PDSCH) signal repeatedly transmitted as many times as indicated by the CQI index, and measuring CSI for a CSI reference resource; And feedbacking the measured CSI using a physical uplink shared channel (PUSCH) signal.
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