Adsorption of 4,5-bis(benzoylthio)1,3-dithiol-2-thione (Bz2dmit) on silver surface has been studied by SERS technique. SERS spectrum of bz2dmit adsorbed on silver colloid obtained by using a dispersive Raman spectrometer with 514.5 nm excitation is found to contain only vibrational bands corresponding to the dmit group indicating that Bz2dmit undergoes decomposition on the silver surface to dmit2- ion. FT-SERS spectra of Bz2dmit obtained with chemically deposited silver film substrates exposed to methanolic adsorbate solutions are found to vary with exposure times. Spectra obtained for shorter exposure times contain vibrational bands associated with dmit as well as benzoyl groups: however intensities of bands corresponding to benzoyl groups are found to diminish with increasing exposure times. Decomposition of Bz2dmit is found to he solely due to the surface induced reaction of adsorbed Bz2dmit molecules with solvent molecules.