The purpose of this paper was to describe the synthesis of Sn-Ag nanoparticles by an arc plasma method. Sn-Ag nanoparticles have been successfully prepared by DC arc plasma with hydrogen addition. The prepared nanoparticles were characterized by X-Ray diffraction, transmission electron microscopy and inductively coupled plasma-atomic emission spectrometry. The obtained results indicated that the nanoparticles have high-purity and spherical shape. The average diameter of the nanoaprticles with 100%-Ar arc was 19.8 nm and that with 50%-H-2 arc was 56.5 nm. Another purpose of this work is to investigate the vaporization behavior from molten Sn-Ag mixture with Ar and Ar-H-2 arc. We confirmed the vaporization enhancement of Sri from Sn-Ag mixture by hydrogen in arc plasma. (C) 2007 Elsevier B.V. All rights reserved.