Abstract: As the gradually promotion of directional drilling technology in the project of the prevention and control of the coal mine water, the construction of directional drilling for prevention and control of water is more advantageous to the safety production of coal mine. Combined with the project of Ordovician limestone water prevention and control in a mine of Shaanxi Province, the technological method of preventing and controlling water hole drilling in directional drilling technology is expounded, and the construction technology of the key hole section of directional drilling is systematically studied. The practice proves that water information of target area may be accurately detected by means of the directional drilling, which meets requirements of water prevention and control in mine and provides safety for safety production.