A series of possibilities are shown of increasing the sensitivity of laser microspectral analytical determinations of impurities in minerals, Steels, and aluminium alloys. When the excitation of the spectrum of the laser beam evaporated substance is transferred to a magnetic field, a considerable increase in the intensity of certain spectral lines of the basic and admixed components and a certain decrease in the intensity of the background, are observed. The intensification factor depends on the regime of the laser and the additional impulse discharge, the intensity of the magnetic field, and the utilized spectral lines.