Abstract: A new sample introduction device used for emission spectral analysis has been developed. It is composed of aerosol injection system and high frequency spark atomization control circuit. The working principle and structural design of the device are presented. The device has been successfully applied to the determination of trace boron, lead, tin and silver in geochemical exploration samples. The new system provides an effective way to reduce sample residues in spark atomization from 26.7% to 0.79%. And the analytical precision (RSD, n=12) is also improved from 4.31%～6.81% to 2.37%～3.43% for these elements.