Abstract: In order to improve the gas drainage efficiency in the goaf, with the analysis on the theory of the elliptical parabolic zone and "the vertical three zones", a mathematic model was established and the gas migration pattern in the goaf was analyzed.The paper proposed that borehole end of the gas drainage borehole in the goaf should be laid out at the location between the inner and outer of the elliptical parabolic zone and also should be located at the crack zone bottom of the overburde n strata and at the top of the normal fling zone in that area.The method was applied in Wenzhuang Mine to reconstruct the gas drainage boreholes in the goaf of No.1 50301 coal mining face.The results showed that the gas drainage value was reached to 7.2 m3/min and the ventilation quantity of the coal mining face was reduced fro m the previous 2 050 m3/min to 1 500 m3/min which could solve the gas over limit problem in the top corner and could ensure the mine production to be normally opera ted.