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Abstract In order to ensure the gas not overrun in 3303 working face after the improvement of ventilation in Dayang Mine, gas drainage, gas emission ratio and gas drainage ratio, numerical simulation was conducted based on the measurement result, the result showed that wind drainage was mainly adopted in the mine gas drainage, assisted by gas drainage, U type ventilation working face was taken the place of the U+I type with small leaking wind to make fresh air flow into the deep area. Gas control plan of directional level long drilling hole + high level of directional drilling + buried pipe in upper corner was settled, with correction of the equipment in the plan, the gas drainage system can meet the needs of production.
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