The result shows that the cleat density in coal bed varies in different microlithotype, and the occurrence of cleat is relevant to the grouping sequence of microlithotypes.

• 结果表明，裂隙在不同显微煤岩类型煤体中的分布存在较大的差异，同时裂隙分布的位置与显微煤岩类型的组合序列有关。