Abstract: By using a coke gasification reaction device and an online measurement apparatus of high-temperature compressive strength, the variation of pore structures of coke after gasification with CO₂ and steam was investigated. In addition, the influences of solution loss rate, temperature and pore structure on the high-temperature compressive strength of coke were also studied. The results show that compared with that in CO₂ gasification, the average pore diameter of coke becomes smaller, and the specific surface and the quantity of pore under 100 μm increase in steam gasification. Meanwhile, the global high-temperature compressive strength becomes higher. After reacting with CO₂ and steam, the high-temperature compressive strength of coke will decrease with the increasing of solution loss or temperature. When the coke is gasified at 1 200 ℃, its work(WOC_u) during deforming process will decrease gradually with solution loss. The work(WOC_u) is higher for steam gasified coke than that for CO₂ gasified coke. The deformation shows a trend of decrease with solution loss. At the same solution loss, compared with that after CO₂ gasification, the damage of pore structure variation to the coke strength after gasification with steam is relatively smaller and the deformation resistance is stronger.