The purpose of this paper studied the optimal hydrogen production condition of plasma reforming system to operate the PEMFC. Plasma reforming reactor used with Ni catalyst reactor at the same time, So H2 concentration increased. Also the WGS and PrOx reactor were designed to remove CO concentration under 10 ppm, because CO has effect on catalyst poisoning of PEMFC. The maximum H2 production condition in plasma reforming system was S/C ratio 3.2, CH4 flow rate 2.0 L/min, catalytic reactor temperature 700±5 oC and input power 900 W. At this time, the concentration of produced syngas was H2 70.2%, CO 7.5%, CO2 16.2%, CH4 1.8%. The hydrogen yield, hydrogen selectivity and CH4 conversion rate were 56.8%, 38.1% and 92.2% respectively. The energy efficiency and specific energy requirement were 37.0%, 183.6 kJ/mol. In additional, The experiment of CO2/CH4 ratio proceeded. Also WGS reactor experiment was proceeding on optimum condition of plasma reactor and the exit concentration were H2 68%, CO 337 ppm, CO2 24.0%, CH4 2.2%, C2H4 0.4%, C2H6 4.1%. At this time, experiment result of PrOx reactor were H2 51.9%, CO 0%, CO2 17.3%.