Abstract: Through comprehensive analysis including a large number of borehole data and production mine measured data, the paper basically proved the features that the gas content in West and East of Ewirgol Mining Area is high, low content in middle area. The analysis shows that tectonic evolution of environment is decision factor for gas formation and content, the buried depth of coal seam, roof and floor lithology, hydrogeological conditions are the main factors for gas occurrence. Through comprehensive analysis, the paper concludes that the gas content increases with the increase of buried depth and thrust faults.