In this research electropolymerization of Thiophene (Th) on Stainless Steel (SS) electrode has been studied by applying cyclic voltammograms in acid solutions in nitrogen gas at different reaction parameters for example concentration of monomer, concentration of perchloric acid and temperature. The electropolymerization method respects first order kinetics with respect to the concentration of monomer, the order of reaction with respect to the supporting electrolyte concentration (HClO 4 ) was found to be 0.743. The experimentally achieved equation of kinetic was PR = KE [HClO 4 ] 0.743 [monomer] 1.017 . A easy mechanism for the electrochemical reaction of (Th) was suggested and the apparent activation energy was define. The obtained dark films of Polythiophene (PT) were characterized by FTIR, X-ray, TEM and FESEM analysis. Traditional electrochemical methods for the obtained polymer such as cyclic voltammetry and linear sweep voltammetry methods were used to characterized, synthesis and investigate the application of the PT polymer as corrosion inhibitors for stainless steel in 3.5% NaCl.