Abstract: The lateral abutment pressure generated by the mining of the working face disturbs the stability of the sur rounding rock of the adjacent roadway,which leads to the failure of the supporting structure,floor heave and other phenomena in the roadway in the dynamic pressure zone,and even the risk of roof fall.The roadway often needs reinforcement and repair, which increases the support cost and has certain production safety hazards.Hydraulic fracturing roof cutting and pressure relief can eliminate or weaken the disturbance of mining pressure to adjacent roadways.Based on the background of multiple prepara tion roadways parallel to the air duct in the mining protection dynamic pressure area of 2120 W working face of Qianjiaying Mine,the short cantilever beam structure model of hydraulic fracturing roof cutting and pressure relief is constructed by means of theoretical calculation,numerical simulation and field test.The compression effect of short cantilever beam structure and ma sonry beam structure on section coal pillar is compared and analyzed.The feasibility of roof cutting and pressure relief roadway protection is analyzed.The deformation and stress distribution of surrounding rock and the development law of roof cracks under different regional conditions of non-roof cutting and fracturing are studied.The key technical parameters of advanced roof cut ting and pressure relief are given.The results show that the average stress of the section coal pillar of the roof cutting and pres sure relief short cantilever beam structure is 49.32% lower than that of the masonry beam structure without roof cutting.When fracturing the edge of coal pillar,the middle and deep part of coal pillar and the deep part of coal pillar in goaf respectively, compared with the condition of no roof cutting,the deformation of protected roadway is reduced by 66.87%,79.38% and 73.24% respectively,and the peak value of vertical stress of coal pillar is reduced by 8.99%,13.62% and 13.89% respec tively.The middle and deep part of fracturing coal pillar is the optimal scheme.It is determined that the fine sandstone of the o verburden rock is the sub-key layer,the vertical height of the fracturing is 13.1 m,the inclination angle of the borehole is 60°, the depth of the borehole is 16.4 m,the spacing of the borehole is 10 m,and the initiation pressure is 12 MPa to 48 MPa (the oretical value is 28 MPa).The industrial test was carried out on site,the results show that the deformation of the surrounding rock of the protected roadway was within the controllable range,which provided a basis for roadway protection under similar conditions.