Abstract: This paper, based on hydraulic fracturing mechanism of crossing borehole, we research and analyze the influence factors affecting crossing borehole by numerical simulation test method. The results show that under the experimental model parameters, the crack pressure increases with the increase of the dip angle of the coal seam, and gradually decreases with increasing angle after reaching the peak, according to the analysis of comprehensive fracture pressure and fracturing effect, the optimal angle of hydraulic fracturing is 45° to 60°; with the increase of metamorphic degree of coal and the homogeneous degree, the fracture pressure will also increase. The influence of lateral pressure coefficient on coal fracture pressure is mainly decided by the size of the minimum principal stress level.