The dielectric barrier discharge system usually shows resonance phenomenon，which affects the output efficiency of power supply．Therefore，it is very meaningful to study the discharge system resonance．The resonance of volume discharge system composed of two panel electrodes was experimentally studied．The results show that the discharge system has LC parallel resonance characteristics;the discharge system resonates only when discharge operates in filament mode;the resonant frequency increases，and the resonant current decreases with the increase of electrode gap;When the content of argon is less than 30%，the oscillation disappears．