In porous media body applied to boiler equipment in order to study the combus-tion characteristic, based on the theory of porous media combustion, methane/Carbon dio x-ide premixed gas(1:4) was established in 2.8MW hot water boiler combustion of single step reaction model, through the numerical simulation, comparison and analysis of the por-ous medium body materials, location, and the influence of porosity on the combustion char-acteristic, it is concluded that the combustion temperature distribution, combustion emis-sions cloud distribution change.Results show that the porous medium material is silicon carbide, choose 0.5 and porosity of porous media is installed on800mm, is more advanta-geous to the boiler combustion.