To study the coke pore structure and changes in the process, Guiyang lean coal was selected as the research object, samples were made under two different oxygen-enriched atmospheres and three different combustion reaction temperatures.The functional group changes and surface pore distribution of coke samples were analyzed by the FTIR and specific surface area and porosity analyzer respectively.The effects of oxygen-enriched combustion conditions on functional groups and pore structures and the characteristics of combustion products at different reaction temperatures in oxygen-enriched combustion atmospheres were discussed.The results show that the number of hydroxyl groups decreases with the increase of the experimental temperature. In the same ratio of oxygen-enriched atmosphere, with the increase of reaction temperature, coke adsorption isotherm changes from typeⅡtotypeⅢ. With the progress of the reaction, the number of micropores and large pores in coal samples changesalot. When the oxygen concentration is 40%, many micropores which are open at both ends are on the coke surface,a large number of closed pores at one end formed due to the collapse of part of the channels at 900 ℃.