Abstract: In order to determine the source of gas emission and ration composition of blasting mining face, determine a reasonable ventilation design and development of gas control measures, measured through on-site element method to study face amount of air leakage distribution and composition of gas emission in quantitative research the realationship between the face air volume and air emission gas volume, and the amount of air leakage and the goaf gas Emission. Studies suggest that blasting mining face amount of airflow to carry the gas along the trend of gradually increasing tendency to present to the return air, Lane End position reached a maximum rate of increase of gas emission in a large area is situated at the surface of the work of the Department.