The invention relates to an MIMO communication method and a base station apparatus and terminals. The MIMO communication method means conducting MIMO communication among a base station comprising multiple antennas and multiple terminals stored in the base station. The method comprises the steps of dividing the multiple terminals in the base station into a first group and a second group; the orthogonal codes are distributed to each group; the distributed codes are used to expand the sending data on multiple terminals; the data obtained by expansion is multiplied by a preset precoding matrix to obtain a channel matrix of the channels among the multiple antennas and multiple terminals; the data obtained by multiplying the precoding matrix is multiplies by a complex conjugate matrix of the channel matrix; and the data obtained by multiplying the complex conjugate matrix is sent through the multiple antennas.