A detailed chemical kinetic mechanism describing the combustion of CH2Cl2under fuel-rich conditions has been developed and tested. The mechanism involves the participation of 82 stable and radical species in 680 reversible elementary reactions and provides a reasonable prediction of species concentration profiles measured previously in atmospheric-pressure, premixed, one-dimensional laminar flat-flames of CH2Cl2/CH4/O2/Ar mixtures (Qun and Senkan 1990). For the case of major species, the agreement between the model and experimental data was good. However, for minor combustion intermediates, the agreement was satisfactory considering the originality of the reaction mechanism. The major reaction pathways responsible for the formation and destruction of the reactants, intermediates and products have been identified via the calculation of reaction rates.