Gas drainage technology with separated sources was applied in a coal mining face to address gas overrunning issues. By optimizing drainage pipelines, gas in the goaf was drained separately from the mining seam. The results showed that gas volume fractions in the air return flow and upper corner were around 0.36%-0.46% and 0.4%-0.6% respectively. The gas drainage average rate reached 59.17% after implementing the separated sources gas drainage technique.