By the coke gasified reaction device and online measurement high-temperature compressive strength apparatus, the variation of pore structures of coke after gasified reaction with CO₂ and H₂O was investigated. Research illuminating the influences of solution loss rate, temperature, and carbon species on compressive strength of coke was also carried out. The results showed that the total compressive strength was higher than for the reaction with CO₂. The high-temperature compressive strength of coke decreased with the increasing of solution loss ratio or temperature after reacting with CO₂ and H₂O. At the same solution loss ratio, the damage of pore structure to coke strength after gasified reaction with H₂O was relatively smaller and the deformation resistance was stronger when compared with that in CO₂.