The invention provides a time domain equalizer training method, able to be applied to the time domain equalizer of the receiver in wire communication, including the steps: estimate channel according to pseudo-random sequence; quantize the impact response of the estimated channel into Q-bit integer; calculate aided matrixes an and B; calculate matrix: C equal to A-1B; calculate eigenvector corresponding to maximum eigenvalue of the matrix C; quantize the eigenvector according to system demand, to obtain tap coefficient of the time domain equalizer. It can be applied to different systems by setting different parameters; can be applied to receivers at LAN and user ends by proper configuration. It achieves real-time realizing effect.