To　address　the　using　problem　that　the　combustion　efficiency　and　Nitrogen　Oxides　(NOx)　emission　of　Natural　Gas　(NG)　after　hydrogen　doping　(H2)　are　less　studied,　using　the　component　transport　model,　Eddy　Dissipation　Concept　(EDC)　combustion　model　and　Do　radiation　model,　at　same　time　combining　with　the　GRI-22　chemical　reaction　mechanism,　to　establish　a　soft　(MILD,　moderate　or　intense　low　oxygen　dilution)　combustion　simulation　model　is　established.　The　reliability　of　the　model　is　verified　by　comparing　it　with　the　experimental　results,　and　the　model　is　further　applied　to　analyze　the　effects　of　different　hydrogen　doping　ratios　on　the　combustion　characteristics.　The　results　show　that　with　the　increase　of　hydrogen　doping　ratio,　the　mixing　degree　of　fuel　and　oxidant　gradually　increases,　and　the　radial　component　of　mixed　gas　decreases;　due　to　the　increase　of　reaction　rate　and　exothermic　rate,　the　temperature　inside　the　burner　increases,　and　the　thermal　NOx　content　increases,　mainly　concentrated　in　the　back　end　of　the　burner;　the　increase　of　fuel　inlet　speed　leads　to　incomplete　combustion　inside　the　burner,　the　temperature　at　the　outlet　decreases,　the　oxygen　concentration　increases　and　the　NOx　content　decreases.　It　is　found　that　hydrogen　blending　in　natural　gas　is　more　favorable　to　achieve　MILD　combustion　conditions.　©　2022,　Solar　Energy　Periodical　Office　Co.,　Ltd.　All　right　reserved.