A soft x-ray spectra of double-driven laser-produced Ta plasmas is measured by a time-integrated space-resolved keV crystal spectrometer from 045 to 075nm- Some resonant transition of the Ni-like, Co-like and Fe-like ions and some intrashell transition of the Ni-like ions are identified- The experimental results have been processed, the spectroscopic line intensity of the higher ionization stages is obtained- The effect of the double-laser driven time difference on the plasma condition is inferred through the spectroscopic line ratio diagnostics- The results obtained can, at least in part, give a good explanation of the upper lasing level population and the ionization properties of the plasmas-