Abstract: Based on the variation of kinetic parameters such as average apparent kinetic energy, maximum ratio of hydrocarbon generation and its corresponding main kinetic energy, main interval of hydrocarbon generation,combined with analysis of coal metamorphic process, several evident stages during a pyrogenic hydrocarbon generation of the Paleozoic coal in the east margin of the Ordos Basin has been elaborated here, i.e. early pyrolysis (0.5%<R_o,m<0.8%), metaphase pyrolysis (0.80%<R_o,m<1.65%)and terminal pyrolysis(R_o,m>1.65%). In the study area, the secondary hydrocarbon generation would be more beneficial to formation, accumulation and conservation of coalbed methane when the superimposed metamorphism of the Yanshan Period exerts the coals under the rank of 0.95%R_o,m.