Abstract: Dante-recorded temporal waveforms have been unfolded using fast fourier transformation （FFT） and the inverted convolution theorem of Fourier analysis. The conversion of the signals to time-dependent soft x-ray spectra is accomplished on the IBM-PC/XT-286 microcomputer system with the code DTSP including SAND n reported by W. N. Mcelory et al.. An amplitude-limited iteractive and periodic smoothing technique has been developed in the code DTSP. Time-resolved soft x-ray spectra with sixteen time-cell, and time-dependent radiation, T_R（t）, have been obtained for hohlraum targets irradiated with laser beams （λ= l.06μm） on LF-12 in 1989.