Conversion of carbon dioxide (CO2) using gliding arc plasma was performed. The research was done to investigate the effect of variation of total gas flow rates and addition of auxiliary gases - N-2, O-2, air, water - to the CO2 conversion process. This system shows higher power efficiency than other nonthermal plasma methods. Experiment results indicate the conversion of CO2 reaches 18% at total gas flow rate of 0.8 L/min and produces CO and O-2 as the main gaseous products. Among auxiliary gases, only N-2 gives positive effect on CO2 conversion and the power efficiency at N-2 concentration of 95% and total gas flow rate of 2 L/min increases about three times compared to pure CO2 process. (C) 2006 Elsevier B.V. All rights reserved.