Indonesian lignite and Chinese bituminous coal were pyrolyzed under different heating rates be-tween 1℃/min and 150℃/min, and the chars obtained thereby were steam-gasified in a fixed-bed micro-reactor at temperatures between 800 and 1000℃ and under the steam partial pressures between 0.26 and 0.57 atmo-spheres. The chars obtained by fast pyrolysis at the heating rate of 150℃/min exhibited higher gasification of gasification of the two samples were almost same : 114KJ/mol and 113KJ/mol. The char surface areas esti-mated by gas adsorption exhibited opposite results depending on the adsorption gas, N₂ or CO₂. The surface areas estimated from CO₂ adsorption were higher for the fast-pyfrolyzed chars than for the slowly-pyrolyzed ones. Formation of many micropores in the fast-pyrolyzed chars, evident from transient pressure change in the adsorption experiment, was responsible for the relatively high gasification rates.