Abstract: The paper analyzes the serious situation of air leakage in the secend slicing of Baijigou Coal Mine which is located in the country's largest fire area.Through on-site incestigation and theoretical analysis, the main air leakage pathways and channels are determined. The calculation model is established based on the result, the function fitting and simulation are made according the obtained data, and visual danger area is obtained, which provides theoretical foundation for the Baijigou coal mining in plugging mine wind.