Abstract: The air leakage flow field in large area goaf is complex, and the air leakage law is not clear. Once coal spontaneous combustion occurs, it will threaten the safety of the mine. In this study, taking the large area goaf of Baodian Coal Mine in Shandong Province as an example, the dynamic changes and coupling of complex flow fields such as temperature field, gas seepage field and gas concentration field in the large area goaf are studied by means of field observation and numerical simulation. The relationship between coal spontaneous combustion and high temperature on gas migration in large area goaf is analyzed. The results show that pressure is the direct driving force to induce gas migration in large area goaf. Under the influence of thermal buoyancy, the flow direction of the gas changes, O₂ around the suction area migrates and accumulates to the high pressure area at the top of the goaf in the negative pressure area at the bottom of the goaf, expanding the range of oxidation heating zone in the goaf and accelerating the spontaneous combustion of coal. By controlling the wind speed of the air leakage source in the goaf, the risk of spontaneous combustion in the goaf can be reduced, and the emission of harmful gases in the deep part of the goaf can be controlled.