Abstract: According to the situation of low penetrability and high gas at 12503 fully-mechanized working face in a coal mine, the gas parameters of 12503 working face are optimized, by using the methods of theoretical analysis and field measurement, the absolute emission quantity of gas is 21.3 m³/min at 12503 working face; the roof fractured zone extraction and the coal seam extraction are adopted at 12503 working face. The effect of gas extraction is analyzed by field data, the extraction quantity of gas is 10.31 m³/min and the extraction rate of working face is 48.4%, the gas extracting effect can reach the standard. The gas extraction at 12503 working face can ensure the safe and efficient production, and can be used as references for popularization and application in other fields with similar conditions.