Abstract: Optimized layout of gas drainage hole of 1081 working face should be done to solve the problem of gas concentration overrun in stopping process of this working face of a coal mine frequently. Through the analysis of influence factors to gas drainage effect by drilling, stopping area divided into several areas of relevant drills space according to different pre-draining time to make full use of construction drilling by using theoretical equation of drilling layout space. Through arrangement face hole in the front of the working face in according with “Three Zones” theory, could improve drilling extraction ratio effectively. It proves that this drilling layout plan has key practical value in drainage parameters design.

Key words: Gas drainage, Space between drills, Pre-draining time, Face hole