Abstract: To restrain the shock wave and flame propagation of gas explosion effectively, a large scale circular pipeline experimental system for gas explosion was constructed, and the inhibitory characteristics of foam ceramics on shock wave and flame propagation during gas pre-mixed explosion were studied. The results show that foam ceramics can absorb gas premixed explosion shock wave energy, the inhibition effect of flame and shock wave propagation is obvious. The number, thickness and location of foam ceramic baffles are the key factors. The distance between the baffle position and the ignition end is very important, and its critical value should be within the maximum position of the flame propagation velocity during the detonation period to realize the effective suppression of the gas explosion propagation and development. Compared with single-layer baffle mode, the maximum overpressure of shock wave decreases faster when double-layer baffle is installed. The influence of baffle thickness is not obvious, when the baffle with a thickness of 50 mm or 30 mm is set, the attenuation trend of the maximum overpressure is consistent and the magnitude is very similar.