Аннотация:The possibilities of LIF diagnostics of CH radicals and soot precursors produced during the combustion in atmospheric pressure methane-oxygen/air flames are discussed. The experimental technique and procedure to visualize and to measure absolute concentrations and temperature in a planar laminar strained diffusion flames produced in the counter-flow burner are demonstrated. The kinetic modeling of the flame is also prepared so that the comparison between experimental and numerical modeling will be possible.