The effect of several parameters, such as peak voltage, frequency, and geometry, on the NO removal efficiency and energy utilization efficiency of a dielectric barrier discharge (DBD) reactor has been investigated in this work. NO removal efficiency and specific input energy (SIE) was augmented with the increase of voltage from 2.5 kV to 6.5 kV. For a given voltage, the maximum of NO removal efficiency and SIE were attained at resonance frequency. Single-dielectric DBD reactor with a discharge gap of 3.5 mm obtained the highest discharge power and NO removal efficiency. The energy utilization efficiencies of different DBD reactors were also compared.