In this paper, the high voltage power supply for dielectric barrier discharge (DBD) have been design and constructed by using a function generator, power amplifier and twin car’s ignition coil. Three different types of electrode configurations namely, cylindrical-cylindrical, cylindrical-plate and parallel-parallel were used in the experiment. The air discharge gap between the dielectric layers was fixed at 3 mm. The main objective of this study is to study the effect of the concentration of potassium chloride (KCl) in liquid electrode of the DBD at atmospheric pressure on the uniform discharge and number of electrode on the discharge voltage. Finally, we investigate the usage of DBD system with cylindrical-cylindrical electrode for waste water treatment.