Abstract: In order to solve the problem that during the process of coal winning in contiguous seams, the adjacent coal seam gas is easy to flow into the working face from the conductive mining fracture zone, which brings the safety problems such as gas overrun. Taking the contiguous seams mining in Shanxi Xiaohuigou Coal Mine as the research object, the similar simulation test and field test were used to study the law of surrounding rock stress-fracture evolution characteristics of No.03 coal seam and No.2 coal seam under the influence of repeated mining in the mine. The range of overburden fracture zone on the stope was delineated, the reasonable position of extraction borehole was determined, and the gas extraction effect was improved. The test results show that when No.03 coal is coal winning, and the working face is advanced to 33 m and 50 m, the maximum development height of the separation layer is 4 m and 14 m respectively. With the advancement of the working face, the maximum development height of the separation layer is 28 m. No.02 coal seam is in the range of the fracture zone of No.03 coal seam, and the fracture forms a gas migration channel. At the same time, pressure of the overlying rock behind the open-off cut increases, and the pressure concentration coefficient is about 1.6. When the working face is advanced to 33 m, the abutment pressure of overburden increases behind the open-off cut, and the pressure concentration coefficient is about 1.6. There is a stress-relaxed area between the open-off cut and the working face, and a stress-concentrated area in front of the working face. The pressure concentration coefficient is about 1.6. With the increase of the advancing distance, the abutment pressure concentration coefficient increases to 2.74. When No.2 coal seam is coal winning, significant vertical cracks appear at both ends of the goaf, which are connected with the original cracks of No. 03 coal seam. It expand and run through the top of the model, and the abutment pressure concentration coefficient of overburden decreases from 2.55 to 1.95. In the field test, the final hole of high-level borehole in 2201 working face was controlled in the fracture development area of 30 m to 35 m above the goaf, and the gas concentration in the return airway was reduced from 0.78% to 0.35%, which achieved good gas control effect.