A channel measurement method, comprising: obtaining, by a user equipment, for a to-be-measured frequency band comprising at least one reporting subband and at least one missing subband, channel state information of each reporting subband and channel state information of each missing subband, wherein the channel state information of each reporting subband is obtained based on channel estimation, and the channel state information of each missing subband is obtained according to a reference rule with reference to channel state information of a reporting subband, wherein the channel state information of a reporting subband is indicated by the reference rule, wherein the reporting subband indicated by the reference rule is in the at least one reporting subband; and sending, by the user equipment, a measurement report of the to-be-measured frequency band to a base station, wherein the measurement report comprises the channel state information of the at least one reporting subband, and wherein the measurement report does not comprise the channel state information of the missing subband, so that the base station may obtain, for each missing subband, channel state information of the missing subband according to the reference rule with reference to the channel state information of the reporting subband that is indicated by the reference rule, wherein the method further comprises: receiving, by the user equipment, reference rule indication information from the base station, wherein the reference rule indication information is used to indicate the reference rule, and the reference rule is one of a plurality of reference rules; and determining, by the user equipment, the reference rule based on the reference rule indication information. obtaining, by a user equipment, for a to-be-measured frequency band comprising at least one reporting subband and at least one missing subband, channel state information of each reporting subband and channel state information of each missing subband, wherein the channel state information of each reporting subband is obtained based on channel estimation, and the channel state information of each missing subband is obtained according to a reference rule with reference to channel state information of a reporting subband, wherein the channel state information of a reporting subband is indicated by the reference rule, wherein the reporting subband indicated by the reference rule is in the at least one reporting subband; and sending, by the user equipment, a measurement report of the to-be-measured frequency band to a base station, wherein the measurement report comprises the channel state information of the at least one reporting subband, and wherein the measurement report does not comprise the channel state information of the missing subband, so that the base station may obtain, for each missing subband, channel state information of the missing subband according to the reference rule with reference to the channel state information of the reporting subband that is indicated by the reference rule, wherein the method further comprises: receiving, by the user equipment, reference rule indication information from the base station, wherein the reference rule indication information is used to indicate the reference rule, and the reference rule is one of a plurality of reference rules; and determining, by the user equipment, the reference rule based on the reference rule indication information. receiving, by the user equipment, reference rule indication information from the base station, wherein the reference rule indication information is used to indicate the reference rule, and the reference rule is one of a plurality of reference rules; and determining, by the user equipment, the reference rule based on the reference rule indication information.