Abstract: In order to assess the influence of pore-damage on the strength, the deformation and the stability of soils, five samples, including four samples with pore-damage and one damage-free sample, were analysed using CT(Computed Tomography)-triaxial testing apparatus under the controlled constant confining pressure and suction. The evolution of pore-damage and the mechanical properties of the samples were studied in this paper. Results showed that the volume of sample and the area of the pore reduced during testing. The shear strengths of the pore-damaged samples were improved 25 per cent under the condition of favorable moisture when the diameter of damage pore was 3 mm. The volumetric strains of pore-damaged samples were less than that of the damage-free sample. The shear strengths of the samples were identical when the areas of the damaged pores were similar. However, the volumetric strains were different even though the areas of the damaged pores were the same.