Abstract: According to the gas content over the limit problems at the top corner and the tail head of the rear scraper conveyor of the coal mining face in Jiaojiazhai Mine, the gas drainage with the pipeline buried at the top corner, the gas drainage with slanting crossed boreholes in mining seam and the gas drainage with high level crack boreholes along roof strike were applied.The comparison on the three gas drainage methods was conducted.The results showed that the measures of the gas drai nage with pipeline buried at the top corner would require small construction quantity, but the drainage rate was lower (