Abstract: In the process of gas content determination in Xima Coal Mine, the sampling process of core tube sampling method is cumbersome, the sampling time is long, the sampling method of orifice powder is affected by the residual powder in the borehole, and the sampling position cannot be accurately calibrated and the measurement error is large. The gas-water exchangable deep hole quick sampling device was applied in 1216 return air lane in No.2 mining area of Xima Coal Mine. The application results show that the sampling effect is good. When the wind pressure is 0.4 MPa in the field construction, the sampling depth of the borehole is 60 m to 80 m（the sampling depth is greater than 100 m under sufficient wind pressure）, the sampling time is not more than 2 min, and the sampling rate reaches 100%.