Abstract: Pore structure of tectonically deformed coals in Zhuxianzhuang mine southern Huaibei coalfield was studied based on the mercury intrusion method. Menger sponge model was used to study the characteristics of seepage holes and diffusion holes. Results show that: Transformation effect to pore structure from tectonism weakens with the decrease of scale, with the gradual increase of coal deformation degree, macropore and mesopore pore volume increased significantly, transitional-pore pore volume increased to some extent, while micropore volume changes very little, pore structure becomes complicated; fractal dimension has good applicability to the study of tectonically deformed coals’ pore structure characteristics and deformation characteristics. With the increase of coal mass deformation, fractal dimension tended to increase; fractal dimension slowly increases in brittle deformation stage and sample fractal difference becomes larger, while fractal dimension significantly increases and sample fractal difference relative decrease in ductile deformation phase. With the increase of fractal dimension, pore volume and porosity index increase; pore volume ratio of seepage hole decreases negative index, pore volume of diffusion pore increases linear; seepage hole has a higher proportion when D＜3.1, the proportion of the diffusion hole pore volume gradually exceed seepage hole pore volume; Seepage channel increased, gas adsorption capacity strengths, coal reservoir permeability is often reduced.