This article takes the strong impact working face of the thick and hard roof slab in Hujiahe Mine as the engineering background to address the problem of easily induced rockburst. By comprehensively using theoretical analysis, on-site monitoring and other research methods, the mechanism of thick and hard roof slab induced impact is revealed, and a criterion for the initiation of thick and hard roof slab impact is established. The downhole directional long drilling segmented hydraulic fracturing technology is proposed, and the spatiotemporal response changes of microseismic in the fractured area and non fractured area are compared and analyzed to verify the anti impact effect of regional fracturing load reduction. The results indicate that the "F-shaped" suspended roof structure formed by the thick hard roof covering the working face serves as the source of dynamic and static load supply, providing a path for inducing impact initiation; The fracturing of the thick and hard roof in the area has caused it to lose the load conditions that trigger impact initiation, hindering the path of impact initiation; The release of microseismic events has shifted from "high energy and low frequency" to "high frequency and low energy" forms. In the un fractured area, microseismic events with energies of 102-103J are the main ones, accounting for about 60.3%, while in the fractured area, microseismic events with energies less than 102J are the main ones, accounting for about 46.2%; The average energy and energy released per meter in the fracturing area are at a relatively low level and have stable changes. The concentrated impact of mining is far away from the working face and reduces the degree of mining influence. The regional fracturing has a good effect on load reduction and anti-collision.