Abstract: Based on the oxidation conducted on the low rank non-caking coal with the constant temperature method under the rich oxygen condition, the functional group quantitative analysis and the infrared spectroscopy technology were applied to study the relationship between the low temperature oxidation degree and coal part icle size, the oxidation time and oxidation temperature of the low rank non-caking coal.The thermogravimetry analysis was applied to study the oxidation kinetics proces s of the low rank non-caking coal.The results showed that with the particle size of the low rank non-caking coal reduced, the oxidation time extended and the temperatu re increased, the oxidation degree of the low rank non-caking coal would be increased and the intendancy of the spontaneous combustion would be enlarged.The oxidat ion of the non-caking coal would be more easily occurred than gas coal and the storage time of the non-caking coal would be shorter than gas coal.