In the gas mine or gas and coal outburst mine, the gas in upper corner is the key to the matter of the production safety, and the high drill gas drainage technology is a frequently-use treatment measure in a working face. How to determine the scope of fracture zone is very important to this technology. In this paper, we designed a method to test the scope of fracture zone of different position in working face, according to the arrangement characteristics of working face, furthermore, we verified veracity of the test by field experimentation. The results show that at the different position in the working face, the scope of fracture zone is differently, and with the increase of distance to the return airway, the gas drainage concentration was increasing, the scope of fracture zone was to be higher. With the extracting of the working face, the drainage drills’ position will be under to the scope of fracture zone gradually, then, the gas drainage concentration will be reduced.