In this paper, the physical similarity theory and simulation method is based, through a coal mined zones similar simulation experiments obtained goaf under varying ventilation rate and different experimental conditions of high temperature and closed and so the distribution of methane concentration, and its detailed analysis, whereby the gas migration law in goaf. Using FLUENT software simulation on gas migration law in goaf bench prototype is simulated by a similar experiment and numerical simulation shows that, when taken out area ventilation is constant, upward along with the deepening of goaf gas concentration is increasing along side the tendency of the gas concentration increases from the inlet side to the return air by gas floating up the role at the height of the upper part of the gas concentration mining empty area at the bottom of the gas concentration is higher than the empty area.
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