The present application relates to the field of communications and provides a method and apparatus for determining channel state information (CSI). The method includes a network side device determines a measurement mode for CSI, the measurement mode being that the network side device performs transmission using M code words by means of transmit points corresponding to M demodulation reference signal (DMRS) port groups, and M is greater than or equal to 1, and each of the code words corresponds to one DMRS port group, the network side device determines N CSI-RS resources according to the measurement mode, the N CSI-RS resources being used for a terminal to determine CSI of transmit channels corresponding to the M code words, the transmit channels corresponding to the code words being transmit channels from the transmit points of the code words to the terminal, M being less than or equal to N.