Abstract: The stability of the bottom pillar roadway is the key of the natural caving method.The high-level 16 m bottom column is densely packed with mining funnels, mining, ventilation, unloading chambers and other projects, and its integrity is weakened.With the induced dynamic pressure caused by mining activities such as bottom blasting and mining, the stability of the roadway of the bottom column is deteriorated, especially the deformation and damage of the roadway near the complex fault zone with multiple faults, the number of repairs and repairs is frequent, the safety hazard of production is increased, and maintenance is maintained.The cost is extremely high.Taking a copper mine of natural caving method as an example, the deformation and failure mechanism of the bottom pillar roadway under complex structural conditions with multiple faults is analyzed.The ground pressure control measures are proposed to increase the ultra-fine cement after the double-layer spray anchor net+long anchor cable support body wall.The combination of active and passive support is realized, and the deformation of the roadway is controlled to ensure the safe production of the mine.