Based on the experimental data and calculation,the enhancement effects in the production of hydrogen by sorption-enhanced steam reforming process for different CO2 removal fraction was tested.The study proved that the thermodynamics constraint of steam reforming can be overcome and the calcium oxide forming calcium carbonate incessantly drives the equilibrium-limited WGS forward by removing the CO2 product from the reaction mixture,which ensures a high yield and purity of H2 with near stiochiometric amount for the reaction.