Abstract: In the course of dip head-driving, the face end is usually made accumulate water by water percolation of adjoining rock and wet-drilling in the face end. The action of water cushion at the bottom of holes, hole water pressure blasting action, water seal action and water wedge action mechanism are analyzed in detail in the paper when soaking-hole blast happens. Making full of the favorable action of the water in the blasting, which is tested and applied in our mine, driving efficiency is increased by 30~50%, driving cost is decreased, blasting fly-rocks, blasting vibration, blasting noise and blasting dust are efficiently reduced, the security of underground construction is improved, and better economic benefits and social benefits are created.