Abstract: In order to find out the main control factors of gas content in Fanzhai field，this paper systematically collect the gas geological data of Ⅱ₁ coal seam in Fanzhai mine field，and analyze the geological structure，burial depth，bedrock thickness，coal thickness，surrounding rock，coal quality and other geological factors on the coal gas content.Make bedrock thickness，coal thickness，roof closure coefficient of 20 meters as variables，use regression analysis method to establish the gas content prediction model.The gas content of Ⅱ₁ coal seam is predicted according to the model equation.It is to provide safety data for the mine field.