In this study, sol-gel thin film is coated on copper alloys, the sol-gel thin film precursor is TEOS hydrolysis with aqueous solution. Sol-gel thin film is coated on metal substrates by dip coater then dry in oven. From the result of salt spray test and electrochemical analysis, it could be found the coated copper alloys have better anti-corrosion effect than bare copper alloys in 5% NaCl solution. Furthermore, the thin film thickness is measured by SEM and profile mete.