Abstract: In order to improve the mine water disaster prevention and control technology, based on the summary of the drilling construction in Chensilou Coal Mine for many years, the deflection mechanism and law of the borehole for underground floor grouting transformation are statistically analyzed. The results show that the error between the vertical inclination of the borehole and the vertical depth of the final hole point is the largest, the azimuth deviates to the right, and the deviation is relatively small, which is easy to form a blank zone and affect the effect of water disaster control. By analyzing the influencing factors of coal seam floor lithology and different BHAS, a complete set of comprehensive drilling deviation correction measures are put forward, such as increasing the guide, giving priority to the use of threaded drill pipe, controlling the drilling speed and feed pressure during lithology change, and strengthening equipment maintenance, which greatly improves the accuracy of drilling construction and reduces the invalid footage, The cost of mine water disaster control is saved, which provides a basis for the next water disaster prevention technology and guides the mine safety production.