The effect of chloride carrier in spectrographic analysis has been investigated with carrier distillation method.It is observed that all of the chlorides added to the oxide sample increased the line intensities.Same results are obtained when the carrier is mixed homogeneously with the oxide sample or placed upon the sample as two layers.The line intensities of elements are proportional to the amount of the carrier added.According to the experimental results,it is believed that after the ignition of the arc,the chloride carrier which has lower boiling point is first vaporized,and then reacts with the solid oxides.During the chlorination between heterogeneous phases,the more volatile metal chlorides are formed,which increase the concentration of these elements in the plasma,and consequently increase the line intensities.