A precoding matrix indication method, comprising: receiving, by a terminal (11, 400), a control signaling transmitted from a network side device (12, 500), wherein the control signaling comprises N bits of precoding information, and the N is a positive integer; determining, by the terminal (11, 400), a quantity of precoding granules according to a scheduling resource, and determining, by the terminal (11, 400), bits of the precoding information of each of the precoding granules in the N bits of precoding information according to the quantity of the precoding granules, wherein each of the precoding granules comprises at least one subband, and each of the at least one subband comprises at least one Physical Resource Block; and acquiring, by the terminal (11, 400), a precoding matrix indicated by the bits of the precoding information of each of the precoding granules, wherein acquiring by the terminal (11, 400) the precoding matrix of each of the precoding granules comprises: selecting, by the terminal (11, 400) from a precoding matrix group corresponding to each of the precoding granules, the precoding matrix indicated by bits of the precoding information of the precoding granule; the precoding matrix group corresponding to any one of the precoding granules is same as the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix group corresponding to any one of the precoding granules is different from the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix groups corresponding to respective some of the precoding granules are same; and characterized in that in a case that the precoding matrix group corresponding to any one of the precoding granules is different from the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix groups corresponding to the respective some of the precoding granules are same, the precoding matrix group corresponding to each of the precoding granules is notified through a pre-acquired signaling or is pre-agreed. receiving, by a terminal (11, 400), a control signaling transmitted from a network side device (12, 500), wherein the control signaling comprises N bits of precoding information, and the N is a positive integer; determining, by the terminal (11, 400), a quantity of precoding granules according to a scheduling resource, and determining, by the terminal (11, 400), bits of the precoding information of each of the precoding granules in the N bits of precoding information according to the quantity of the precoding granules, wherein each of the precoding granules comprises at least one subband, and each of the at least one subband comprises at least one Physical Resource Block; and acquiring, by the terminal (11, 400), a precoding matrix indicated by the bits of the precoding information of each of the precoding granules, wherein acquiring by the terminal (11, 400) the precoding matrix of each of the precoding granules comprises: selecting, by the terminal (11, 400) from a precoding matrix group corresponding to each of the precoding granules, the precoding matrix indicated by bits of the precoding information of the precoding granule; the precoding matrix group corresponding to any one of the precoding granules is same as the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix group corresponding to any one of the precoding granules is different from the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix groups corresponding to respective some of the precoding granules are same; and characterized in that in a case that the precoding matrix group corresponding to any one of the precoding granules is different from the precoding matrix group corresponding to any other one of the precoding granules, or the precoding matrix groups corresponding to the respective some of the precoding granules are same, the precoding matrix group corresponding to each of the precoding granules is notified through a pre-acquired signaling or is pre-agreed.