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A novel transmission grating spectrometer, called a dual-transmission grating spectrometer, has been designed and established. This spectrometer adopts two transmission gratings to disperse x rays twice, which suppresses the overlap of the grating higher-order diffraction, cuts out the transfer of experimental errors in unfolding the measured x-ray spectrum effectively, and increases the x-ray spectrum measurement precision. It was shown by experiment that the dual-transmission grating spectrometer was applicable to precisely measure the soft-x-ray spectrum from laser-created plasmas. © 2003 American Institute of Physics.