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系统分析了广西未变质煤、区域变质煤、岩浆变质煤和热液变质煤的Ｘ射线衍射特征。随煤变质程度升高，（００２）衍射峰的衍射角增大、半高宽缩小、芳环层面网间距缩小；（１０ｌ）衍射峰从无到有、半高宽缩小；第Ⅲ衍射峰仅在无烟煤中出现。对烟煤而言，其有序化程度的升高主要取决于煤中稠合度小的有机化合物的脱落；对无烟煤而言，其有序化程度的升高则取决于热液作用的次数和时间的长短。
The X-ray diffraction characteristics of unmetamorphic coal, regional metamorphic coal, magmatic metamorphic coal and hydrothermal metamorphic coal in Guangxi were systematically analyzed. As the degree of coal metamorphism increased, the diffraction angle of the (002) diffraction peak increased, the FWHM decreased, and the spacing of the aromatic ring layers narrowed; (10l) diffraction peak decreased from zero to full width at half maximum; Appears in anthracite. For bituminous coal, the degree of ordering is mainly due to the loss of organic compounds with small degree of coalescence in coal. The degree of ordering of anthracite coal depends on the number and time of hydrothermal reaction The length of