Wang, R.-R., Dai, Y.-S., Li, C., Zhang, P. and Tan, Y.-C., 2015. A new double deconvolution method suitable for non-stationary seismograms in the time-frequency domain. Journal of Seismic Exploration, 24: 401-417. Conventional deconvolution methods are based on the assumption that the seismogram is stationary; however, actual seismic data cannot satisfy the above assumption. Thus, this paper proposes a double deconvolution method in the time-frequency domain to improve the resolution of the non-stationary seismogram. First, the quadratic spectrum modeling method, in combination with the bispectrum method based on higher-order cumulants, was used to extract a wavelet from the non-stationary seismogram, and the spectrum division method was applied to the entire seismogram to perform deconvolution. Then, time-varying wavelets were extracted from the first deconvolution result in the time-frequency domain, and the residual wavelets on every point spectrum were eliminated from the seismogram by a second deconvolution. Simulation experiments and field data processing demonstrated that the proposed method overcomes the interference of adjacent strata effectively and greatly improves the resolution of the non-stationary seismogram.