Abstract: A novel Modified Gabor Spectrum（MGS） method is proposed.Restricting the auto-term supports of MGS on the supports of Gabor coefficients，a good Time-Frequency Representation（TFR） is obtained.Compared with the method of Gabor Spectrum（GS），the MGS has three merits.First，computation cost is reduced greatly.Second，the cross-terms are removed effectively and simultaneously the auto-terms are almost unchanged.Thirdly，the resolution and concentration of time-frequency are improved by high order operation.Compared with the methods of GS and AOK，experimental results show better TFR performance of the MGS.