The aim of this study is to investigate an organic film formed on titanium surface by electrolysis of ionic liquid. The ionic liquid of imidazole system, [C_8H_<15>N_2][PF_6], was used for electrolyte preparation. Mirror polished titanium and platinum plate as an electrode were used. A constant VDC of 40 was applied between the electrodes for 180 s via a DC power unit. FTIR and AFM were employed to study the organic film. The electrolytic oxidation reaction of the imidazole ring resulted in forming the organic film.