Fuel reformer using plasma and shift reactor for CO oxidation were designed and manufactured as H2 supply device to operate a polymer electrolyte membrane fuel cell (PEMFC). H2 selectivity was increased by non-thermal plasma reformer using GlidArc discharge with Ni catalyst simultaneously. Shift reactor was consisted of steam generator, low temperature shifter, high temperature shifter and preferential oxidation reactor. Parametric screening studies of fuel reformer were conducted, in which there were the variations of the catalyst temperature, gas component ratio, total gas ratio and input power. and parametric screening studies of shift reactor were conducted, in which there were the variations of the air flow rate, stema flow rate and temperature. When the O2/C ratio was 0.64, total gas flow rate was 14.2 l/min, catalytic reactor temperature was 672 ℃ and input power 1.1 kJ/L, the production of H2 was maximized 41.1%. And CH4 conversion rate, H2 yield and reformer energy density were 88.7%, 54% and 35.2% respectively. When the O2/C ratio was 0.3 in the PrOx reactor, steam flow ratio was 2.8 in the HTS, and temperature were 475, 314, 260, 235 ℃ in the HTS, LTS, PrOx, the conversion of CO was optimized conditions of shift reactor using simulated reformate gas. Preheat time of the reactor using plasma was 30 min, component of reformed gas from shift reactor were H2 38%, CO<10 ppm, N2 36%, CO2 21% and CH4 4%.