The rock in Dulanggou mine is hard and dense with the characteristics of weak abrasiveness and high drillability. The drilling efficiency and footage are low with large amount of auxiliary work and long drilling cycle in the earlier-stage construction. By using TXY75 wire-line coring hydraulic impactor technology, drilling “slip” was effectively overcome, drilling efficiency and footage were improved with less core plugging, reduced auxiliary time and higher efficient net drilling time.