岩体的局部冒落长期困扰着地下矿山的安全生产，对其进行预防、预报势在必行。在分析常用研究方法的基础上，通过对切变时间的分析研究，提出了监测围岩冒落的预警系统，采用自制仪器进行初步实验，取得了较好的效果。 Local caverns of rock masses have troubled the safety of underground mines for a long time, so it is imperative to prevent and forecast them. Based on the analysis of common research methods, an early warning system for monitoring the fall of surrounding rock was put forward by analyzing and researching the shear time. The preliminary experiment was carried out by using homemade instruments, and the good results were achieved.