Abstract: In order to ensure the safety production of the working face of low gas occurrence and high strength mining face passing through the fault structure, the DF16 fault in 12302 working face of Wangjialing Mine is selected as the research object. Firstly, the influence of the stress state of the fault on gas migration in the fault area is analyzed. Then, the gas occurrence characteristics of coal seam in fault area are proved by means of field measurement and the gas emission law before and after the fault is analyzed. Finally, through field observation, the gas emission characteristics of fault area working face are mastered, and the key factors causing abnormal gas emission are further revealed. The results show that the gas content of coal seam in the DF16 fault structure area of 12302 working face is significantly higher than that in the normal mining area before and after the fault, and the gas content in the upper part of the fault is greater than that in the lower part. The gas emission of the working face in fault structure area is significantly higher than that of the normal mining area. Gas emission mainly comes from the desorption of broken coal body and the gas released by newly exposed coal body during coal cutting in this coal seam. The key factors that cause the significant increase of gas emission in the working face are the increase of coal seam gas content and coal cutting speed in fault structure area. The research results provide the targeted guidance for the gas control work in similar conditions.