To study the effect of thermal conductivity of different pore foam ceramics’ suppression gas explosion,in this paper,different pore foam ceramics of 15 mm thickness were carried out experiment in square pipe of 200 mm×200 mm cross - section,their thermal conductivity were evaluated,and their three - dimensional microcosmic structure were analyzed.The results show that the thermal conductivity of pore foam ceramics is smaller than that of medium pore foam ceramics,the effect of pore foam ceramics’ suppression gas explosion is better than that of foam ceramics with medium hole,for explosion suppression material of the same material,its thermal conductivity is worse,then its effect of its suppression on gas explosion is relatively better.The results of study have importandy theoretical significance and practical value to explore materials that suppress gas explosion and prevent disaster in coal mine.