Introduced about the principles and features of ZD150 type bighole drill and discussed the main facts for influnce on the highly quality of the drill hole.

Based on the field experiences and related information gathered in a quarry,the author established the technical feasibility and profitability of using large diameter drill string to quarry dimension stones on a large scale for the construction of dam surface in the hydroelectric industy.

According to Yangquan coal miningpractice, launches the application study that the great diameter perforate substituted with the trough to traverse into technology in opening, and popularizes and applies to gas drainage from adjacent layer.