Abstract: The south yellow sea use single-time-window synthetic seismogram in the past, namely reflection coefficient of logging curve and theory wavelet deconvolution, but the formation of shallow and deep have different frequency, leading to synthetic seismogram and real seismic profiles match poorly. This paper proposes on seismic wavelet extraction using multi-time-window synthetic seismogram, extraction of seismic wavelet and spectrum analysis, the formation of shallow and deep seismic wavelet frequency and waveform is different, and considering the time delay characteristic, apply the analysis results of seismic wavelet to do multi-time-window synthetic seismogram. compared to the previous single-time-window synthetic seismogram, multi-time-window synthetic seismograms is advance, and improve the synthetic seismogram and seismic wave group match degree and resolution rate.