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Laminar methane/air premixed fl ames at different pressures in a newly developed high-pressure laminar buer are studied through Cantera simulation and filtered Rayleigh scattering (FRS). Different gas component fractions are obtained through the detailed numerical simulations. And this approach can be used to correct the FRS images of large variations in a Rayleigh cross section in different fl ame regimes. The temperature distribution above the fl at buer is then presented without stray light interference from soot and wall refl ection. Results also show that the extent of agreement with the single point measurement by the thermocouple is<6％. Finally, this study concludes that the relative uncertainty of the presented filtered Rayleigh scattering diagnostics is estimated to be below 10％in single-shot imaging.