A　new　method　of　synthesis　Ag/Au　core/shell　nanostructure　with　ultraviolet　(UV)　excimer　laser　was　studied.　It　was　found　Ag/Au　core/shell　nanostructures　with　spherical　shell　could　be　prepared　by　UV　excimer　laser　which　is　obviously　confirmed　by　high　resolution　transmission　electron　microscopy.　The　surface　plasma　resonance　of　this　nanostructure　can　be　tuned　by　controlling　thickness　of　the　Au　shell.　Simulation　based　on　Mie　theory　was　in　agreement　with　the　result　of　the　experiments.　Moreover,　it　is　indicated　the　Ag/Au　core/shell　nanostructure　has　excellent　activity　in　surface-enhanced　Raman　scattering.　This　Ag/Au　core/shell　nanostructure　may　be　applied　to　high　sensitive　trace　detection　in　the　future.　(C)　2014　Laser　Institute　of　America.