In this paper it is focused on the study of No.6coal bed of Nan Tong Coal Mine inNan Tong Mining Bureau, conducting single-axle load test and triaxial load test of coalon MTS-815material testing machine, analyzing the deformation and damagecharacteristics if coal during load testing period, and finding some ways to establishdamage constitutive equation under the assumptions of thermodynamics and equivalentprinciple. In the end of the paper, triaxial load test is performed on special coals withdifferent gase...