Abstract: In this paper, based on the principle of seepage mechanics, the mathematical model of gas migration in stope was established, CFD technology and space distribution function of empty degree were applied to implement equation of discontinuous regions of space, and then the paper simulated gas flow field and gas concentration field distribution under the conditions of individually using special tail roadway to dredge gas and tail roadway dredging combining with gas extraction. The results show that the goaf gas emission at return side contact corners lane combined with the goaf gas extraction has very significant effect on gas control in return corner.