In　order　to　obtain　the　precise　predicted　values　of　methane/hydrogen/air　burning　velocities　from　simulations,　the　performances　of　GRI　mech　3.0,　Aramco　mech　1.3,　USC　mech　2.0　and　San　diego　mech　mechanisms　were　systematically　studied　under　various　conditions　by　PREMIX　code　and　compared　with　experimental　data　from　literature.　The　conditions　where　each　mechanism　gave　their　good　performance　are　obtained　and　concluded.　The　flowrate　sensitivity　and　rate　constants　of　key　elementary　reactions　were　analyzed　to　insight　the　different　behavior　of　each　mechanism.　The　results　showed　that　all　these　widely　used　small　hydrocarbon　mechanisms　could　gave　reasonable　predictions　for　pure　methane　and　methane　hydrogen　blends.　Nevertheless,　they　lack　sensitivity　for　rich　hydrogen　at　elevated　pressures　due　to　their　complex　reactions　competitions　controlled　by　hydrogen　sub　model.　USC　mech　2.0　was　found　more　suitable　for　being　used　at　low　hydrogen　contents　while　San　diego　mech　gained　better　results　at　high　hydrogen　contents.　GRI　3.0　gave　good　predictions　for　methane　hydrogen　blends　except　for　high　initial　pressures.　Generally,　Aramco　mech　1.3　showed　the　best　performance　for　all　testing　conditions.　Moreover,　there　was　relatively　large　deviation　from　the　predicted　results　and　experimental　data　in　the　transition　regime　where　the　hydrogen　fractions　were　between　60%　and　80%,　it　may　could　be　optimized　by　tuning　the　rate　constants　of　reactions.　(C)　2017　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.