Hydorgen　is　a　promising　clean　renewable　energy　carrier.　The　premixed　combustion　of　lean　hydrogen　enriched　fuels　is　one　of　the　vital　methods　to　develop　low-emission　gas　turbine　with　high　performance.　The　present　study　was　focused　on　the　influence　of　hydrogen　addition　on　the　detailed　flame　structure　of　turbulent　premixed　Bunsen　flames　using　CH4/H2/air　mixture.　The　preheat　zone,　reaction　zone　and　burned　zone　were　experimentally　measured　with　simultaneous　CH2O/OH　planar　laser　induced　fluorescence　(PLIF)　technique.　The　flame　thickness　of　preheat　and　reaction　zone　was　extracted　and　statistical　analysis　were　performed.　The　results　show　evident　impact　from　hydrogen　addition　on　the　flame　structure.　Especially,　the　hydrogen　broadens　the　reaction　zone　slightly　but　largely　decreases　the　preheat　zone　thickness.　©　2021,　Science　Press.　All　right　reserved.