Abstract: In order to reveal the law of gas flow and distribution in working face with "two inlets and one return" Y-type ventilation, the gas flow in working face with Y-type ventilation and goaf was simulated numerically by porous media model. The results show that:when the air distribution ratio of intake airflow roadway and headentry is 1:1, gas accumulates in the upper corner due to the low speed turbulence zone caused by local resistance and airflow diversion; because the tail roadway is connected with the intake airflow roadway, gas emission occurs in the upper corner of the working face; the gas concentration in the working face decreases with the increase of the air distribution ratio between the intake airflow roadway and headentry, and the gas concentration in the headentry shows a slight decrease trend overall with the increase of the air distribution ratio; the gas concentration in goaf increases first, then decreases, and then increases along the direction, with the increase of air distribution ratio, the gas concentration increases as a whole. The research results can provide a basis for the selection of air distribution ratio in working face.