By studying the quantitative evaluation methods of porous materials suppressing and isolating gas explosion, the evaluation mathematical model based on overpressure and flame temperature were proposed. Through introducing a concept of quenching parameter and combining evaluation methods of pressure inhibition and flame suppression, a new comprehensive quantitative evaluation mathematical model was proposed. The region of ideal suppression and isolation effect of gas explosion was determined. The product-quenching parameter evaluation method one of comprehensive quantitative evaluation model was used to quantitatively assess effect of inhibition and suppression and optimize porous materials. The results show that the effect of pressure inhibition and flame suppression are reflected in the model，which can be used to evaluate effect of gas explosion suppressing and isolating and provide scientific basis for porous material performance evaluation in the experiment and engineering applications.