In this study, a clean coal gasification technology was developed for production of H-2-rich gas from coal with CaO as sorbent. The conditions including [CaO]:[C] ratios, reaction temperature, and reaction time for the coal gasification process were optimized. The products were H-2, CH4, CO, and CO2. The highest H-2 percentage (82.66%) for bituminous coal was obtained at [CaO]:[C] = 2:1 and T = 1203 K. Meanwhile, the highest H-2 percentages for high-sulfur coal and high-sulfur coke were 77.41 and 81.57% at [CaO]:[C] = 1:4 and T = 1203 K, respectively. Moreover, the residual H2S were 0.28 and 2.19%, correspondingly.