Abstract: In view of the stability problems such as stress concentration, roadway heaving floor and others in coal pillar areas are prone to occur due to the lagging collapse of the roof in the goaf under the thick and hard roof condition in Hongliu Coal Mine, taking the I040204 working face as the background, a hydraulic fracturing roof cutting and pressure relief technology of "directional drilling+segmentd fracturing" is adopted, combined with roof structural characteristics and geostress distribution, fracturing parameters and borehole spacing are optimized, a radial fissure network extending along the maximum principal stress direction is constructed to achieve controllable crack induction and roof stiffness weakening; In the construction process, the water injection strategy is dynamically adjusted based on stress and heaving floor response data to improve crack guidance quality and water injection uniformity. The actual measurement results show that the average stress of surrounding rock after fracturing is decreased from 11.7 MPa to 6.9 MPa, and the heaving floor is decreased from 611 mm to 91 mm, with a decrease of 40.6% and 85% respectively. The research shows that this technology has the advantages of significant effect, small disturbance, high construction safety and others under the condition of high strength roof, it is suitable for thick and hard roof control engineering with dense structure and weak fissure development, and has good engineering adaptability and promotion value.