Abstract: In order to study the effectiveness and influence of a new type of gel foam on the role of the inhibitor for the coal, based on temperature programmed experiments, coal sample groups with different particle sizes were tested before and after gel foam treatment.The oxygen consumption rate, CO and CH₄ gas volume fraction and their production rate, as well as the resistance rate of gel foam on coal samples during the heating process were analyzed.The results show that the oxygen consumption rate varies with the size of coal, and the concentration and production rate of CO and CH₄ gas in the coal sample treated by the new gel foam are significantly lower than that of the untreated coal sample; at 100 ℃, the resistance rate of coal samples with particle size less than 0.9 mm is 59.23%, that of coal samples with particle size from 3 mm to 5 mm is 61.69%, and that of coal samples with particle size from 6 mm to 10 mm is 65.63%, the order of coal samples with different particle sizes affected by the resistance of gel foam is large particle size > medium particle size > small particle size; the new type of gel foam material can effectively delay the oxidation process of coal, inhibit the combined reaction of coal and oxygen, delay the process of coal heat storage, and play a very positive role in preventing coal spontaneous combustion.