Abstract: The preferential extraction of oil and gas from tar-rich coal under medium-low temperature pyrolysis conditions is an important development direction for the green and low-carbon development of tar-rich coal resources. The pore and fracture structure of tar-rich coal reservoirs and their permeability characteristics are the key factors affecting the in-situ heating efficiency and oil and gas production rate. A three-dimensional equivalent pore network model was established using micro-CT scanning and image processing technology, enabling detailed characterization of the multi-scale pore structure of tar-rich coal samples at different temperatures. The COMSOL fluid-solid coupling numerical simulation method was employed, along with the Beacher model and Monte Carlo random simulation theory, to construct a discrete fracture network seepage model. The evolution laws of the pore structure and permeability characteristics of tar-rich coal under high temperature were revealed. The results show that as the temperature increases, the pore structure, connectivity, and porosity of the tar-rich coal samples exhibit phase change characteristics. In the temperature range of 25 ℃ to 300 ℃, due to water evaporation and gas desorption, the small pores of the tar-rich coal samples transform into medium and large pores, showing a decrease in the number and volume of small pores, while the number and volume of medium, large, and super-large pores first increase and then decrease. The pore volume of small, medium, and large pores decreases, the pore volume of super-large pores increases. The throat number and coordination number slightly increase. In the temperature range of 400 ℃ to 600 ℃, the organic matter pyrolysis and “expansion effect” lead to an increase in the number and volume of small pores in the tar-rich coal samples, while the number and volume of medium, large, and super-large pores first increase and then decrease. The proportion of medium, large, and super-large pores decreases, and the throat number and coordination number increase significantly. The multi-scale evolution of the pore and fracture structure of the tar-rich coal sample under high temperature shows a phased change trend, with permeability gradually increasing slowly at first and then rapidly increasing. At the same time, the permeability of the sample is significantly affected by the inlet pressure, decreasing first and then increasing with increasing pressure. Under the same inlet pressure conditions, the increase in permeability of the sample becomes significantly greater with increasing temperature.