Abstract: Silver nanoparticles are obtained by dealloying using Mg₈₀Ag₁₀Y₁₀ metallic glass ribbon as the precursor, HCl solution as the corrosion liquid, and polyvinyl pyrrolidone (PVP) as the protective agent. The effects of dealloying time, PVP addition and HCl concentration on the powder morphologies and particle sizes of silver nanoparticles are studied. Furthermore, the surface-enhanced Raman scattering (SERS) is evaluated using the silver nanoparticles as the substrate. The results indicates that the completion time for dealloying of the metallic glass ribbon is 8 hours, and that the silver nanoparticles with good dispersion and an average particle size of 54.7 nm can be prepared in the 0.25 mol/L HCl solution with the addition of 1.5×10^-3 mol PVP for 8 hours. The SERS is evaluated with this kind of dealloyed silver nanoparticles in different concentration of R6G solution.