Abstract: Taking the gas geology theory as the foundation,combining coal geological data with the measured gas parameter,the distribution of igneous rocks,metamorphic degree of coal,coal seam thickness,burial depth of coal seam and the overlying bedrock thickness geological factors on two geological units within the gas occurrence is carried out qualitative and quantitative analysis,the results show that volatile measure of metamorphic degree of coal is the main controlling factors of the gas content of magmatic intrusion,the burial depth and the overlying bedrock thickness are the main controlling factors which affect the gas content of magmatic rock region in coal seam.