Abstract: In order to make reasonable soil covering roller compaction scheme, green time and to prevent the resurgence of coal gangue for coal gangue piles with spontaneous combustion.In this paper, we have applied different pressure variations to the soil sample and discussed the response of the air barrier property to the time of the isolated layers of coal gangue piles through laboratory tests.The results show that the air permeation speed and permeability of soil samples increased in a quadratic function with time, and from the sixth day, the air permeation speed begins to exceed the critical seepage velocity, the air barrier property of the isolation layers decrease; from the nineteenth day the mean air permeability begins to exceed the critical air permeability, and the air barrier property of the isolation layers decreases; the air permeation speed and permeability in isolation layers vary in logarithmic manner with the change of water content, and both increasing with the decrease of water content.