Abstract: Aiming at the coal spontaneous combustion problem in coal mines, a gel foam material that can be used to prevent coal spontaneous combustion in high-temperature areas in underground coal mines has been developed through four-factor and three-level orthogonal experiments. In addition, the thermal stability of the gel foam was studied through the temperature resistance test and the constant temperature water loss rate test. The research results show that the gel foam material with a three-dimensional network structure has the best temperature resistance. Compared with ordinary foam or foam with only foam stabilizer, the temperature resistance time is extended by 55 minutes and 35 minutes, respectively. The water loss rate of gel foam is mainly affected by the time of constant temperature, and the longer the time is, the greater the water loss rate is. The water loss rate is mainly affected by temperature, the higher the temperature is, and the faster the water loss rate is. When the temperature is from 90 ℃ to 140 ℃, the water loss rate reaches the maximum and the water loss rate tends to zero at a constant temperature of 5 h.