This　study　presents　the　flame　structure　influenced　by　the　differential　diffusion　effects　and　evaluates　the　structural　modifications　induced　by　the　turbulence,　thus　to　understand　the　coupling　effects　of　the　diffusively　unstable　flame　fronts　and　the　turbulence　distortion.　Lean　premixed　CH4/H2/air　flames　were　conducted　using　a　piloted　Bunsen　burner.　Three　hydrogen　fractions　of　0,　30%　and　60%　were　adopted　and　the　laminar　flame　speed　was　kept　constant.　The　turbulence　was　generated　with　a　single-layer　perforated　plate,　which　was　combined　with　different　bulk　velocities　to　obtain　varied　turbulence　intensities.　Quasi-laminar　flames　without　the　plate　were　also　performed.　Explicit　flame　morphology　was　obtained　using　the　OH-PLIF.　The　curvature,　flame　surface　density　and　turbulent　burning　velocity　were　measured.　Results　show　that　the　preferential　transport　of　hydrogen　produces　negatively　curved　cusps　flanked　with　positively　curved　bulges,　which　are　featured　by　skewed　curvature　pdfs　and　consistent　with　the　typical　structure　caused　by　the　Darrieus-Landau　instability.　Prevalent　bulge-cusp　like　wrinkles　remain　with　relatively　weak　turbulence.　However,　stronger　turbulence　can　break　the　bulges　to　be　finer,　and　induce　random　positively　curved　cusps,　therefore　to　destroy　the　bulge-cusp　structures.　Evident　positive　curvatures　are　generated　in　this　process　modifying　the　skewed　curvature　pdfs　to　be　more　symmetric,　while　the　negative　curvatures　are　not　affected　seriously.　From　low　to　high　turbulence　intensities,　the　hydrogen　addition　always　strengthens　the　flame　wrinkling.　The　augmentation　of　flame　surface　density　and　turbulent　burning　velocity　with　hydrogen　is　even　more　obvious　at　higher　turbulence　intensity.　It　is　suggested　that　the　differential　diffusion　can　persist　and　even　be　strengthened　with　strong　turbulence.　©　2020　Hydrogen　Energy　Publications　LLC