Abstract: In order to determine the arrangement and extraction parameters of the high drainage roadway reasonably, through the beam tube monitoring, the distribution law of gas concentration of the working face and goaf and the key factors influencing the working face gas emission were studied. The results show that gas concentration increases gradually from the intake airway to the return airway along the tendency of the working face. Within the scope that the goaf is apart from the working face of 33 to 38 m, gas concentration gradually increases to 5%. Deep into the goaf, gas concentration tends to be stable. With the increase of output and advancing speed, the absolute gas emission quantity of fully-mechanized working face increases. However, when the advancing speed exceeds a certain value, it falls. The relative gas emission quantity decays under the law of negative exponent with the increase of output and advancing speed.