The researchers studied how stress, moisture, and gas pressure affect the permeability of coal samples from Tunlan coalmine. They found that confining stress has a bigger impact on permeability than axial stress. The permeability of coal samples follows a 'V' shape with the lowest permeability at 1.1MPa gas pressure. Additionally, as moisture content increases, gas permeability decreases exponentially, dropping by about 70% when moisture content goes from 0.18% to 3.15%. These findings help understand how methane gas moves through coal beds, which can aid in more efficient coalbed methane extraction in the Qinshui basin.