Abstract: In order to achieve efficient gas control in thick and high gas, high geo-stress, and low permeability coal seams, and effectively alleviate the tight situation of “pumping, excavation, and mining” replacement in mines, a test study of ultra-high pressure hydraulic cutting seam pressure relief and permeability-enhancing technology was carried out on the 16219 working face of Jinhe Coal Mine.The test results showed that: For the second layer of coal in the 16219 working face, the maximum cutting seam pressure was 90～100 MPa, the spacing between each cutting seam was 3～5 m, the cutting seam time was maintained for 15～20 minutes, and the average coal output per cutting seam was 0.25～0.41 t.After implementing ultra-high pressure hydraulic cutting, the uniform debris discharge rate in the cutting seam control area was 4.54‰.Before and during cutting, the cutting seam control area had a uniform debris discharge rate of 4.54‰.The maximum energy values are 6.18×10³ J and 6.00×10³ J,respectively.The average daily energy events are 0.4 and 1.9,respectively.The average daily energy sizes are 2.88×10² J and 5.50×10² J,respectively.After cutting, the decrease in the proportion of high-energy events and the increase in the proportion of low-energy events indicate that the use of ultra-high pressure hydraulic cutting can effectively achieve pressure relief and permeability enhancement in thick coal seams.