Abstract: To study the real state of gas occurrence in deep coal seams of Dingji Coal Mine and to reveal the gas occurrence regularity of deep coal seams, the numerical simulation software was used to study gas occurrence characteristics of deep coal seams in Dingji Coal Mine of Huainan coalfield based on the multi physical field coupling model. The result showed that the gas pressure, the gas content and the coal seam permeability exhibited nonlinear distribution with the depth increasing, the deformation quantity of coal body and the temperature of coal had different influence on the gas content and the permeability distribution.