Abstract: In view of the difficult problem of gas control in the upper corner of working face, we proposed a gas extraction technology using a 550 mm ultra large diameter borehole.The fast drilling of super-large diameter borehole is realized by using the once-drilling technology of large diameter drilling machine, the reasonable hole spacing of super-large diameter borehole is 20 m.The purity of single hole gas extraction is 3.6 m³/min, and the gas concentration in the upper corner can be controlled below 0.50% by using the super-large diameter borehole.In addition, compared with the traditional method, the super-large diameter drilling has obvious economic and time-effective advantages in controlling gas in the upper corner.