In order to prevent gas accidents possibly caused by local gas enrichment in Beichuan Mine, the characteristics of mine gas emission were analyzed based on the actual gas production data of the mine and its influencing factors from various aspects were studied. The research results showed that the mine gas mainly came from the mining face, followed by the mining roadway and the goaf area. The mine was a low gas mine, but with gas accumulation in some working faces, thick coal seam, the high coal rank, and complex geological structure, relatively closed and large coal seam depth were the main reasons for the high gas content in the mine field, which in turn affected the amount of gas emission; in addition, gas emission and atmospheric pressure, coal mining technology and mining intensity were related, the lower the atmospheric pressure, the more backward the coal mining process, the higher the raw coal output, the greater the gas emission.