Southern region of Inner Mongolia coal freezing depth was beyond the wellbore depth of 15 m commonly, after the freeze, hole sealing quality was out of control and other problems, freezing hole would most likely be between each aquifer water channel. The mine into the second phase construction conducted freezing hole, which could cause major disasters such as borehole tilt, flooded Wells accidents. Combined with Nalinhe No. 2 Mine all deep freezing method sinking and half deep freezing method sinking situation analysis and compasison，under the same formation conditions, half deep freezing method successfully completed the wellbore of digging and realized mine phase ii project construction safely and quickly, eliminated mine water inrush disaster because of freezing hole and provided valuable experience for future similar projects.