Thermal plasma gasification has been demonstrated as one of the most effective and environmentally friendly methods for MSW treatment. In this study, experiments were carried out in a 30 kW direct current thermal plasma gasification system, specifically focusing on the influence of feedstock type, steam/carbon ratio, running power and continuous feed rate on the product characteristics. As the S/C ratio increased, the H2 yield increased firstly and then decreased and reached the maximum value of 36.42 mol/kg at the S/C ratio of 0.84 while the H2 content continued to grow from 59.87–61.04%. The H2 proportion in syngas and H2 yield both showed a steady rise trend with the increase of running power. Continuous feeding method was conductive to the promotion of syngas LHV. Compared with other conventional technologies, plasma gasification exhibits superior capacity of H2 production (H2 proportion of 60.34 vol.% and H2 yield of 39.77 mol/kg).