Non-thermal plasma technologies were known to be effective for decomposition of dilute pollutant gases. In the present study the dielectric discharge plasma was examined in order to decompose toluene vapor, a kind of air pollutant VOCs. The dielectric barrier discharge plasma using the conventional AC as an electric power source was generated inside the tubular reactor in which the porous γ-Al₃O₃ beads were packed. In order to investigate the adsorptive effect of the packed dielectrics the non-porous glass bead was also examined and compared with the γ-Al₃O₃ for the abatement of toluene vapor. Experiments were carried out at the electric voltage of 16 kV and 19 kV and at the temperature of 25℃, 60℃, and 100℃ respectively. The kinetic velocity and activation energy of toluene decomposition reaction was studied in the γ-Al₃O₃ beads packed reactor. The γ-Al₃O₃ bead showed better performance for toluene decomposition than the glass bead. AS the reactor temperature rising, the toluene decomposition rate also increased. Additionally the effect of dielectric constant of the packed dielectric was studied. The dielectric of higher dielectric constant showed better performance than that of lower one.