A feedback method of channel state information, wherein the method comprises: acquiring (101, 201), by user equipment, first channel state information based on a first channel state information measurement resource configured by a base station, and acquiring second channel state information based on a second channel state information measurement resource configured by the base station, wherein the first channel state information measurement resource and the second channel state information measurement resource respectively correspond to a first antenna port representing a horizontal dimension of an antenna array and a second antenna port representing a vertical dimension of the antenna array; and feeding back (102, 202), by the user equipment, channel state information to the base station, wherein the channel state information comprises third channel state information, which is obtained by the user equipment based on the first channel state information and the second channel state information, and wherein the first channel state information comprises first precoding matrix indicator information and first rank indicator information RI1, and the second channel state information comprises second precoding matrix indicator information and second rank indicator information RI2, wherein the first precoding matrix indicator information further comprises a first type of precoding matrix indicator PMI1 and a second type of precoding matrix indicator PMI2, and the second precoding matrix indicator information further comprises a third type of precoding matrix indicator PMI3 and a fourth type of precoding matrix indicator PMI4; and wherein the third channel state information comprises: third precoding matrix indicator information, third rank indicator information, and a channel quality indicator, CQI, wherein the CQI is obtained by the user equipment based on the first channel state information and the second channel state information, wherein the third precoding matrix indicator information is obtained based on at least three of the PMI1, the PMI2, the PMI3, and the PMI4, and wherein the third rank indicator information is obtained based on the RI1 and the RI2. acquiring (101, 201), by user equipment, first channel state information based on a first channel state information measurement resource configured by a base station, and acquiring second channel state information based on a second channel state information measurement resource configured by the base station, wherein the first channel state information measurement resource and the second channel state information measurement resource respectively correspond to a first antenna port representing a horizontal dimension of an antenna array and a second antenna port representing a vertical dimension of the antenna array; and feeding back (102, 202), by the user equipment, channel state information to the base station, wherein the channel state information comprises third channel state information, which is obtained by the user equipment based on the first channel state information and the second channel state information, and wherein the first channel state information comprises first precoding matrix indicator information and first rank indicator information RI1, and the second channel state information comprises second precoding matrix indicator information and second rank indicator information RI2, wherein the first precoding matrix indicator information further comprises a first type of precoding matrix indicator PMI1 and a second type of precoding matrix indicator PMI2, and the second precoding matrix indicator information further comprises a third type of precoding matrix indicator PMI3 and a fourth type of precoding matrix indicator PMI4; and wherein the third channel state information comprises: third precoding matrix indicator information, third rank indicator information, and a channel quality indicator, CQI, wherein the CQI is obtained by the user equipment based on the first channel state information and the second channel state information, wherein the third precoding matrix indicator information is obtained based on at least three of the PMI1, the PMI2, the PMI3, and the PMI4, and wherein the third rank indicator information is obtained based on the RI1 and the RI2.