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Oxygen-enriched (O2/CO2) combustion in circulating fluidized bed(CFB) is one of the most promising clean coal combustion technology which shows good gaseous pollutants control, especially greenhouse CO2. In the paper, the thermogravimetric experiments of Hennan lean coal-char under O2/CO2 and O2/N2 atmosphere have been carried out, the influence of atmosphere, O2 concentration and heating rate on the combustion characteristic of coal-char being analysed. The results of the experiment show that O2 concentration and heating rate have a great influence on the coal-char combustion characteristics in oxygen-enriched environment. The coal-char combustion characteristic ameliorates with increasing the O2 concentration and improving the heating rate. Under the same O2 concentration, the coal-char combustion characteristic in O2/CO2 atmosphere is a little poorer than that in O2/N2 atmosphere. A reaction kinetic model for coal-char combustion in oxygen-enriched environment was also deduced and it agreed well with experimental data.