为探讨岩爆形成机理，应用扫描电镜对岩爆岩石断口微观形态进行了观察研究．结果表明：岩石解理断裂存在一个明显的主断裂路径，岩爆断裂的微观机制主要是在拉伸、剪切作用下岩石发生低应力脆性断裂；从岩石断裂微观形态研究岩爆岩石断裂，可以更好地揭示岩石断口微观形貌特征、裂纹生核、扩展及断裂方式与岩爆演进过程的联系 In order to investigate the formation mechanism of rock burst, the microscopic morphology of rock burst was observed by scanning electron microscopy. The results show that there is a clear main fracture path in the rock cleavage fracture. The micro-mechanism of the rock burst is mainly caused by the low stress and brittle fracture of the rock under the tensile and shear conditions. From the micro-morphology of the rock fracture, Better reveal the microscopic topography characteristics of rock fracture, the relationship between the nucleation, propagation and fracture modes of rock fracture and the evolution of rock burst