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This research aims to evaluate the electrical characteristics of CO2 and O2 gas discharges by the coaxial-cylindrical dielectric barrier discharge (DBD) reactor. The DBD reactor was made of stainless steel with inner diameter of 17.5 mm and length of 100 mm while Teflon tube placing between both electrodes was acted as dielectric barrier. The spacing discharges gap between inner electrode and dielectric barrier was fixed at 1.5 mm width. The high voltage power source was used for applying to both electrodes during CO2 and O2 discharges by following at 11, 15, 19 and 23 kVp. The flow rate of each gas was fixed at 10 ml/min. A high density of discharge current peak occurred at 23 kVp for both gas species. Moreover, the discharge power and energy density by supplying with 23 kVp for CO2 was 0.71 W and 4.28 kJ/L of feed gas, respectively, while the discharge power and energy density at the same voltage for O2 was 0.73 W and 4.37 kJ/L of feed gas, respectively. The conclusion stated that the discharge power and energy density highly related to applied voltage and flow rate of gas, corresponding to the Lissajous figure.