Abstract: In order to further study the problems of air leakage and gas exceeding the limit in goaf under the Y-shaped ventilation method of roof-cutting and retaining roadway, taking the 22301 working face of Tunlan Mine as the engineering background, a fixed-point release SF6 tracer gas was used for on-site inspection of air leakage and gas emission in the goaf of the working face.The research results indicate that the airflow in the working face leaks into the goaf through the side roadway of the goaf and the lower part of the working face cut, and then re-leaks into the working face at the upper part of the working face cut.The air leakage in the goaf increases the difficulty of preventing and controlling the spontaneous combustion of residual coal and gas in the goaf; Before the initial weighting of the working face, the air volume and leakage of the roof-cutting and retaining roadway section showed an increasing trend.The goaf was compacted and stabilized in the later stage, and the air volume and leakage of the retained roadway section gradually decreased, solving the problem of air leakage and gas exceeding the limit in the 22301 working face and ensuring the safety production of the working face.