Based on the theoretical analysis and calculation of the influence radius of gas shock induced fracture in the roof coal of the gob-side roadway, a blasting hole layout scheme and parameters for gas shock induced fracture to enhance top coal caving property of the gob-side roadway were designed. Numerical simulation verification and field engineering application were also carried out. The results show that the roof top coal between the blasting holes enters the plastic yield state due to the phase change gas shock of liquid carbon dioxide along coal pillar side and the middle span of roadway roof, the subsidence deformation of roadway roof along coal pillar side, across the middle, and on the mining side no longer presents a downward convex shape, and the subsidence deformation of the top coal on the coal pillar side and across the middle of roadway near the working face is basically the same and increases significantly. With no affecting the maintenance of the safety entre, the gas shock technique not only significantly improves the caving property of roadway top coal, ensuring the safe and efficient recovery of the roof coal in the roadway, but also eliminates many major security risks with the hanging roof of side working face. This can promote the safe, efficient and sustainable mining of Sanyuan Coal Industry.