A precoding information obtaining apparatus, comprising: a determining module, configured to determine a transformation matrix according to a steering vector of an antenna form and a departure-angle range; a sending module, configured to send, to a terminal, a system information block carrying information about the transformation matrix determined by the determining module, wherein the information about the transformation matrix is used by the terminal to determine a precoding matrix indicator, PMI, according to the information about the transformation matrix, a codebook used for obtaining channel information, and a pilot measurement result; and a receiving module, configured to receive the PMI reported by the terminal; wherein the system information block comprises: a horizontal transformation matrix indicator, used to indicate whether there is the transformation matrix in a horizontal direction; a horizontal transformation matrix dimension, used to indicate a dimension of the transformation matrix in the horizontal direction; a horizontal transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the horizontal direction; and a horizontal transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the horizontal direction; and/or, wherein the system information block comprises: a vertical transformation matrix indicator, used to indicate whether there is the transformation matrix in a vertical direction; a vertical transformation matrix dimension, used to indicate a dimension of the transformation matrix in the vertical direction; a vertical transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the vertical direction; and a vertical transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the vertical direction. a determining module, configured to determine a transformation matrix according to a steering vector of an antenna form and a departure-angle range; a sending module, configured to send, to a terminal, a system information block carrying information about the transformation matrix determined by the determining module, wherein the information about the transformation matrix is used by the terminal to determine a precoding matrix indicator, PMI, according to the information about the transformation matrix, a codebook used for obtaining channel information, and a pilot measurement result; and a receiving module, configured to receive the PMI reported by the terminal; wherein the system information block comprises: a horizontal transformation matrix indicator, used to indicate whether there is the transformation matrix in a horizontal direction; a horizontal transformation matrix dimension, used to indicate a dimension of the transformation matrix in the horizontal direction; a horizontal transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the horizontal direction; and a horizontal transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the horizontal direction; a horizontal transformation matrix indicator, used to indicate whether there is the transformation matrix in a horizontal direction; a horizontal transformation matrix dimension, used to indicate a dimension of the transformation matrix in the horizontal direction; a horizontal transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the horizontal direction; and a horizontal transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the horizontal direction; and/or, wherein the system information block comprises: a vertical transformation matrix indicator, used to indicate whether there is the transformation matrix in a vertical direction; a vertical transformation matrix dimension, used to indicate a dimension of the transformation matrix in the vertical direction; a vertical transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the vertical direction; and a vertical transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the vertical direction. a vertical transformation matrix indicator, used to indicate whether there is the transformation matrix in a vertical direction; a vertical transformation matrix dimension, used to indicate a dimension of the transformation matrix in the vertical direction; a vertical transformation matrix nonzero quantity, used to indicate a quantity of nonzero elements of the transformation matrix in the vertical direction; and a vertical transformation matrix element, used to indicate a value of the nonzero element of the transformation matrix in the vertical direction.