The gas disasters of Huainan mining get more serious as the increase of mining depth. In order to the efficient mining of coalbed gas and adoption of reasonable measures to ensure mine safety in Huainan mining area, gas distribution characteristics were found out and the geological controlling factors of high gas content were analyzed in this study. Research on the law of gas distribution in the Huainan mining area shows that, the CH_4 content which extend in N-W direction and higher in NE area than SW area, CO_2 content in this mining area performances that south area is higher than north area while the N_2 content shows a inverse feature. CO_2 content is high in the hinge zone of PanJi anticline and low in the two wings, N_2 content is on the contrary. Main controlling factors for gas content in this mining area include coal bearing property, buried depth, coal thickness, geological structure and groundwater activity. In addition, gas content was positively correlated with coal bearing property, buried depth and coal thickness. Sealing fault structure is beneficial for gas accumulation while the open fault structure will reduce gas content. Gas content decreases with the lithologic particle coarsening. Retained groundwater is beneficial for methane's accumulation.
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