Abstract: In order to study factors and laws of oxygen transport in loose coal body, taking the self-established high temperature air-breathing experimental apparatus in loose coal as an object, we use CFD software to establish a numerical model experimental apparatus to study the self-entrainment oxygen supply process in different heat source strength, porosity of loose coal of high-temperature region. The results show that with the increased of heat source intensity, the buoyancy lift on airflow is increased in loose coal body, air transport speed can carry more oxygen to the high temperature region; with the increasing of distance from the heat source-side, airflow velocity v will gradually decrease; the speed size and porosity of coal body is positive correlation in the circumstance that the heat source intensity is in a certain; the impact of porosity on total gas pressure distribution of loose coal is small. Leakage oxygen supply channel (airflow channel) in the vertical direction is in favor of the formation and development of the self-entrainment oxygen supply in loose coal high temperature fire zone.