Abstract: To study the permeability characteristics of tectonic coal by using fluid-solid-heat coupling triaxial servo-controlled seepage system of coal containing gas that was developed in house, taking Henan western "three soft" tectonic coal as the research object, we study the permeability characteristics of tectonic coal under the axial cyclic loading-unloading; the test results show that: in the process of axial stress loading, the permeability decreases, and recovered in the process of unloading, permeability of coal samples and axial stress distribution accords with negative exponential function in the process of loading and unloading, and the fitting parameters is given. Relationship between dimensionless permeability and effective stress shows that permeability dimensionless quantity to effective stress is great sensitive, the bigger of effective stress, more fast of dimensionless permeability reduction rate, effective stress decreases, and permeability dimensionless quantity will be restored. Cyclic loading process, the permeability sensitivity for the first load is stronger, permeability loss is bigger. The unloading process, the permeability recovery is less than the initial value. At the same time, the cycle loading to further increase coal sample plastic deformation, also results in lower permeability for the sensitivity of the effective stress.