In order to ensure the safety production and high yield and high efficiency of coal and gas outburst coal mine. In this paper, the No.12 coal in Xima Coal Mine is taken as the research object. According to the field data collection, geological data collection, and the collection of underground coal and rock samples, the laboratory gas basic parameter determination ( coal firmness coefficient determination, gas emission initial velocity index determination, gas adsorption constant determination, gas content and porosity determination ), gas adsorption and desorption law research, multi-field coupling gas outburst numerical simulation research and other work are carried out. Through the combination of indoor laboratory and numerical simulation, the critical value of gas pressure and gas content predicted in the gas outburst coal seam of Xima Coal Mine is P < 0.74 MPa and the critical value of gas content W < 8.0 m3/t. It is of great significance for the prevention and control of coal and gas outburst in mines, and provides technical support for the next mining design and gas control of coal mining enterprises.