Abstract: In order to solve the problem of gas overrun in the return airway and the upper corner, it studied the inboard distance between high drainage roadway and return airway. According to the characteristics of gas flow in stope, it established gas flow coupling model based on Navier-Stokes equation, Brinkman equation, pan-diffusion equation and Fick diffusion theorem, then without high drainage roadway and with different inboard distances, it simulated the characteristics of gas concentration and flow field in stope by using multi-physics coupling analysis software COMSOL Multiphysics, which was verified by specific project examples. The results showed that high drainage roadway of different inboard distances had a significant impact to the effect of gas control in stope. The gas concentration of the top of gob and working face was greater than that of the lower, it took on "V" type relationship between the average gas concentration near the upper corner and the inboard distance. The gas concentration in the upper corner and the upper part of the goaf was the lowest and the effect of gas control was the best when the inboard distance was about 30 m. The results of numerical simulation were basically consistent with the field engineering application, which proved the rationality of the model.