The removal of hydrogen in off-gas from fuel cells is desired to be safely processed. In the present research, simulated molecular hydrogen gas mixed with oxygen and nitrogen gases was directly removed in an intermitt ent dielectric barrier discharge (DBD). Hydrogen was oxidized even in a temperature lower than 100℃. A hydrogen conversion rate of approximately 100% (98.8%) was obtained at a consumes power of 1.2kW for a gas temperature of 80℃. When oxygen concentration was increased, NO was obtained as a by-products. But NO was reduction by increase of equivalence ratio. Their reaction mechanism was investigated at simulation with elementary reactions of H/O systems.