Abstract: In order to effectively suppress the shock waves generated by gas explosion in coal mine, a circular large-scale pipeline experiment system of gas explosion was designed and constructed. The suppression characteristics of porous ceramic foam on shock wave in pre-mixed gas explosion of 8% concentration were studied. The results show that the porous structure of foam ceramic can absorbs the shock wave energy through elastic and plastic deformation for indicating the effects of suppressing and attenuating the shock wave. The number, thickness and location of foam ceramic have certain influences on the suppression of gas explosion propagation. When setting double layer foam ceramic, the maximum overpressure drops faster and the gradient is larger. Thus, the influence of layer number is particularly significant. Foam ceramic installation location from the ignition side to the distance 3 m to 4 m range can successfully suppress the development of the explosion. Foam ceramic thickness has no obvious effect on the explosion shock wave trend but has an impact on the maximum overpressure. Compared with 50 mm thick, 30 mm thick foam ceramic has a stronger inhibiting effect with a hgiher overpressure attenuation rate.