Abstract: In order to solve the problem that a large number of low concentration gas can not be directly used in the gas extraction of coal mines in China, by building a low concentration gas combustion test system in porous media, the combustion temperature distribution and pollutant emission law of low concentration gas in five kinds of porous media burners with different hole density were studied. The results show that the influence of the hole density of the porous media burner on the combustion temperature of the low concentration gas is non-linear function relationship, when the hole density increases from 10 holes to 20 holes, the combustion temperature in the porous media burner tends to increase; when the hole density increases from 20 holes to 40 holes, the combustion temperature in the porous media burner tends to decrease first and then increase. The porous medium with 20 holes has better overall heat transfer effect. Under the same flow rate combustion condition, the CO emission concentration in porous media with different pore density decreases with the increase of equivalence ratio, and the NO emission concentration increases with the increase of equivalence ratio. The CO emission concentration of porous media with a pore density of 20 holes is generally low within the range of measured equivalence ratio, and the NO emission concentration is relatively high; the CO emission concentration of porous media with a pore density of 10 holes is relatively high, and the NO emission concentration is low.