Abstract: The gas distribution and surge of the goaf and stope can be affected directly by the aire movement rule.The porous media model of goaf is established by GAMBIT,and the flow fileld in the area is simulated by yhe hydrodynamics software FLUENT,so as to reveal the speed of air leakage in goaf,the distribution fule of pressure,and the gas migration law in goaf.The research results in this paper is conducive to ensure safety procection of coal mine,and to improve economic benefit of mine. 　

Key words: Goaf, Air speed, Pressure, Gas