Stress distribution rules and deformation and failure properties of coal and rockbodies influenced by mining were analyzed.Experimental research on permeability of coaland rock samples under different loading conditions was finished in the laboratory.In-situmeasurement of coal permeability influenced by actual mining was done as well.Theoryanalysis show that permeability varied with damage development of coal and rock understress,and the influence of fissure on permeability was greatest.Laboratory results showthat under different loading conditions permeability was different and it varied with stress,which indicated that permeability was directly related to the loading process.In-situ testsshowed that permeability is related to abutment stress to some degree.The above resultsmay be referenced to gas prevention and drainage. Stress distribution rules and deformation and failure properties of coal and rockbodies influenced by mining were analyzed. Experimental research on permeability of coaland rock samples under different loading conditions was finished in the laboratory. In situ measurement of coal permeability influenced by actual mining was done as well Theoryanalysis show that permeability varied with damage development of coal and rock understress, and the influence of fissure on permeability was greatest. Laboratory results showthat under different loading conditions permeability was different and it varied with stress, which indicates that permeability was directly related to the loading process.In-situ testsshowed that permeability is related to abutment stress to some degree. above resultsmay be referenced to gas prevention and drainage.