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主要基于我国华北及华南的高煤级煤样品，剖析了煤的电子顺磁共振演化特征，进而对高煤级煤演化的化学机理进行了探讨．结果表明：我国高煤级煤电子顺磁共振信号呈阶段性演化，自由基浓度、线宽和兰德因子分别在镜质组反射率４．０％，８．０％及１０．５％处出现转折或突变，反映出煤化作用的化学机理发生了重大转换；拼叠作用是镜质组最大反射率６．０％之后大分子基本结构单元急剧增大的主要化学机理，化学键的均裂是这种机理得以实现的重要前提条件．
Based on the samples of high-rank coal from North China and South China, the evolution characteristics of coal’s electronic paramagnetic resonance were analyzed, and the chemical mechanism of high-rank coal evolution was also discussed. The results show that the paramagnetic resonance signals of coal at high coal rank in China evolve step by step. The free radical concentration, line width and Land’s factor are 4.0%, 8.0% and 10.5% respectively The turning or abrupt change reflects the chemical conversion of coalification. The main chemical mechanism of the sharp increase of the basic structural unit of the macromolecule after the maximum reflectivity of vitrinite is 6.0% An important prerequisite for this mechanism to be achieved.