The thermal decomposition process of class 2 coal mine permissible emulsion explosive was studied by DSC. The kinetic parameters (the apparent activation energy and pre-exponential factor) of the process were calculated by the Kissinger method,Flynn-Wall-Ozawa method and integral isoconversional non-linear method. The results obtained by Satava-Sestak method indicate that the most probable mechanism function of the process is the Ginstling-Broushtein equation and the reaction mechanism is classified as 3D-diffusion reaction in column symmetry. The comparison of thermal decomposition characteristic temperature with the emulsion temperature and sensitizing temperature in actual production as well as its application temperature shows that the class 2 coal mine permissible emulsion explosive has good thermal safety.