Abstract A detailed chemical kinetic mechanism for the combustion of CH3CI is presented. This mechanism, together with the better understood mechanism of combustion of CH4, was used to calculate the stable species concentration profiles in atmospheric-pressuresooting CH4CI/CH4/O2/Ar premixed flat flames studied previously (Kana and Senkan, 1987), The agreement between the model and experimental data is reasonable. The major reaction pathways responsible for the formation and destruction of species have been identified via the calculation reaction rates and sensitivity analysis.