A detailed surface Raman study of the effect of the bulk concentration of cyanide (CN-), electrode potential.and immersion potential on the adsorption behavior of CN- on the Pt electrode surface was performed on aconfocal microprobe Raman system. The notable change of the C-N frequency and the Pt-C intensity at ca.-0.7 V(vs SCE) indicates a subtle change of the adsorption behavior of CN- on the platinum electrode insolutions with concentration of about 10-4M or lower. The concentration of cyanide in the bulk solutionaffects the adsorption behavior. The surface Raman signal can still be observed at concentrations as low as10-6M. When the CN-concentration is higher than 10-3M, the potential for immersing the platinum electrodein the CN-solution has a remarkable effect on the adsorption behavior of CN-With the high-quality surfaceRaman spectra, the surface enhancement factor for the adsorbed CN- was estimated to be about 150.