The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for reporting channel state information. A method in which a terminal reports control state information (CSI) in a wireless communication system according to an embodiment of the present invention comprises: a step of determining rank indicator (RI) report timing for cases where a value of a precoding type indicator (PTI) is 0; a step of determining wideband first precoding matrix indicator (PMI) report timing; a step of determining wideband second precoding matrix indicator report timing and wideband channel quality indicator (CQI) report timing; and a step of reporting said CSI based on the result of the determination on the reporting timing. The CSI which is reported firstly after the RI report timing in cases where the value of the PTI is 0 can be set to become said wideband first PMI.