Abstract: Time domain synchronous-orthogonal frequency-division multiplexing (TDS-OFDM) system makes use of PN sequence as guard interval, which is used as channel estimation. Because PN serial correlation is not ideal δ function, extra error has been inducted. A channel equalization method suitable for OFDM system is propose in the paper. Cepstral technique is employed in the method to attain the channel equalization. The simulation results indicate that this method has perfect equalization effect.