In the work, photocatalytical treatment of acetic acid wastewater by nanostructured film of TiO2 under ultra-violet ¡]UV¡^ light illumination was studied. Nanosized TiO2 suspension was prepared by the sol-gel process. Then it was dip-coated on indium tin-oxide¡]ITO¡^glass, which could be used as the anode if applicable. Effects the UV light intensity, UV light wavelength, reactive area of TiO2 film, solution pH, and applied bias voltage on photocatalysis efficiency of acetic acid in term of COD removal were studied in this work. Experimental results have shown that a pseudo first-order kinetics was obeyed in all tests. In this study UV light of 312nm outperformed that of 365nm ¡]15.3¢H vs. 11.0¢H¡^. UV light intensity of 20W was also found to be superior to 10W with COD removal of 11.0¢H against 6.7¢H. COD removal at pH¡×3.18 was about 3.6 times greater as compared with that of at pH=9.98. When the reactive area of TiO2 film was increased to three times, the COD removal was almost doubled. An applied external voltage was found to enhance the removal of COD. When an external voltage of 15V was applied, the COD removal was increased to 84.6¢H. It is ascribed to an external voltage would prevent or lower the extent of electron-hole recombination. In this work, the pseudo first-order reaction rate equation K¡¬=1.7679(COD)-0.7547 was obtained for various concentrations of acetic acid tested.