Аннотация:The CH laser induced fluorescence (LIF) measurements in a premixed atmospheric free laminar CH4-air flame are presented in this study. The aim of this investigation is to compare the CH distribution to numerical prediction using complex chemical mechanism. The spatially resolved CH-LIF profiles were measured in the different flame zones above the burner for the flames of different fuel-air ratio. It is found that dynamics of CH-LIF signals correlates well with CH chemiluminescence.