Abstract: In order to clear the gas geological characteristics and controlling factors in Donghuantuo Mine, based on geological exploration data of coal field, gas geology data, mining and drilling data, we study the generation, evolution, occurrence and emission of the gas in study area, and further analyze the geological control factors of gas characteristics. The results show that the gas is mainly formed in the deep thermal metamorphism at the end of Middle Triassic. The gas geological controlling factors include geological structure, depth, thickness, hydro-geological characteristics and litho-logical properties of the coal seam. The reason of low gas content in the mine is the function of large-medium tensional fault and hydrodynamic escape. What's more, the characteristics of coal seam buried depth lead to an increasing trend of the gas content from SE to NW, while the local high value area occurs in the zone of thick coal seam and density lithology of roof and floor. The gas emission increases suddenly from the zone of the small normal fault and the sharply changed zone of coal thickness, and to be more obvious in the deep area. Therefore, attention should be paid to prevent gas anomaly when the mining crosses the zone.