Abstract: The article introduces the auger drilling technology and rapid casing running technology, a kind of on-off type PDC drill bit for dry drilling which used in the auger drilling and rapid casing running technology, the bit mainly consists of bit body, closed center wing, special hinge mechanism and so on, during the test in the Xinjing Coal Mine, 10 bits are used, 21 boreholes have been constructed, the maximum depth is 205 m, the average life expectancy of a single bit is 358 m, the screen rate reaches to 98%. The test shows that the drill bit has reasonable structure design and stable on-off structure, which is suitable for the popularization and application of the drilling technology.