The effects of the diameter of high-voltage electrode wire, the voltage of discharge, the structure of reactor and the total flow rate of H2-O2 feed on the direct synthesis of hydrogen peroxide in ambient conditions by the dielectric barrier discharge （DBD） plasma method were studied.The results showed that the diameter of high-voltage electrode wire, the voltage of discharge and the structure of reactor had pronounced effects on H2O2 synthesis. By using a self-designed DBD plasma reactor （recycled flowing electrolyte as grounding electrode）, H2O2 was synthesized with 32.51% yield at room temperature and atmospheric pressure from H2-O2 feed, which was several times higher than that reported in literature.
