Coal samples from Southern Qinshui Basin were studied to understand how stress affects coal reservoir permeability during coal-bed methane drainage. The researchers found that as effective stress increases, coal permeability decreases significantly. The most significant decrease in permeability occurs when the effective stress is between 2.5 MPa and 9 MPa. Pore pressure can influence coal permeability, with lower effective stress and constant pore pressure leading to increased permeability. However, decreasing effective stress and increasing pore pressure can decrease coal permeability. Overall, the study shows that stress sensitivity plays a crucial role in the permeability of coal reservoirs during coal-bed methane extraction.