A method of reporting channel state information, CSI, by a user equipment, UE, in a wireless communication system, the method comprising: receiving bandwidth part, BWP, configuration information related to a BWP; receiving information for activating a specific bandwidth part among one or more bandwidth parts based on the BWP configuration information; receiving a reference signal; obtaining CSI based on the reference signal; and transmitting the CSI through a physical uplink shared channel, PUSCH, by omitting a part of the CSI in the activated specific bandwidth part, based on a priority rule, wherein the CSI includes a first part and a second part, wherein a portion of the second part is omitted, wherein the CSI includes information related with coefficients for a phase or an amplitude, and each of elements of the information related to the coefficients is classified as a first group and a second group based on a priority value, wherein the priority value is determined based on i) a first factor related to a layer index ii) a second factor related to an index of a spatial domain related to each of the elements and iii) a third factor related to a plurality of indices for a frequency domain related to the elements, wherein the third factor is determined as an order in which a higher index and a lower index from among the plurality of indices for the frequency domain related to the elements are sequentially crossed based on a predefined specific index, the higher index is higher than the predefined specific index, and the lower index is lower than the predefined specific index, and wherein a priority of the first group is defined as higher than a priority of the second group in the priority rule. receiving bandwidth part, BWP, configuration information related to a BWP; receiving information for activating a specific bandwidth part among one or more bandwidth parts based on the BWP configuration information; receiving a reference signal; obtaining CSI based on the reference signal; and transmitting the CSI through a physical uplink shared channel, PUSCH, by omitting a part of the CSI in the activated specific bandwidth part, based on a priority rule, wherein the CSI includes a first part and a second part, wherein a portion of the second part is omitted, wherein the CSI includes information related with coefficients for a phase or an amplitude, and each of elements of the information related to the coefficients is classified as a first group and a second group based on a priority value, wherein the priority value is determined based on i) a first factor related to a layer index ii) a second factor related to an index of a spatial domain related to each of the elements and iii) a third factor related to a plurality of indices for a frequency domain related to the elements, wherein the third factor is determined as an order in which a higher index and a lower index from among the plurality of indices for the frequency domain related to the elements are sequentially crossed based on a predefined specific index, the higher index is higher than the predefined specific index, and the lower index is lower than the predefined specific index, and wherein a priority of the first group is defined as higher than a priority of the second group in the priority rule.