Abstract: Numerical simulation method is adopted to study the flow field distribution under the condition that the gas emission location of the working face is set as the coal wall emission and the working face emission. The results show that: near the gob side along the working face, the gas concentration of setting the location of gas emission as coal wall is lower than that setting gas emission location as whole working face; but near the coal wall side along working face, the gas concentration of setting the position of gas emission as coal wall is bigger than that setting gas emission location as whole working face emission. The distribution of gas distribution, oxygen distribution and spontaneous combustion zone in goaf is basically consistent under conditions of different gas emission positions. For example, studying the flow field distribution of the working face, the gas emission source location must be set up correctly according to the actual situation of the coal mining working face; if the research object is flow field distribution of goaf, gas emission location can be set as gas emission of working face to reduce the complexity of modeling.