Performance of electro-oxidation (EO) and UV/electro-oxidation (UV/EO) on atrazine (ATZ) removal was investigated under various operating factors. Because of synergistic effect on ATZ removal, UV/EO was the most effective process, followed by UV/chlorine, EO, UV irradiation, and chlorination, respectively. Although the energy consumption of UV/EO for 90% removal was similar to that of EO, UV/EO removed ATZ 1.8 times faster than EO. Boron doped diamond (BDD) exhibited greater ATZ removal than dimensionally stable anode (DSA), and performance of BDD was stable for treatment of 50 cycle times (100 h). Performance of EO and UV/EO on ATZ removal increased with higher current density and low pH. ATZ removal by EO and UV/EO was independent to NaCl concentrations (300-1000 mg.L