Abstract: In order to study the process of spontaneous combustion and the influencing factors of loose coal pile in high temperature zone during storage and transportation, a three-dimensional typical physical model of loose coal pile was established by COMSOL. Through theoretical analysis, the model parameters of coal pile under multi-field coupling of velocity field, oxygen concentration field and temperature field were determined, and the equation of multi-physical field coupling control was used for simulation solution.The results show that the spontaneous combustion period of three-dimensional typical loose coal pile is 57 d, and the high temperature zone is distributed symmetrically in the middle and lower part of windward side of coal pile; when the wind speed is in the range of 0.001 m/s to 0.35 m/s, the spontaneous combustion period first shortens and then prolongs with the increase of wind speed. When the wind speed exceeds 3.5 m/s, the internal temperature of coal pile no longer changes with time and is far below the critical temperature of spontaneous combustion; with the increase of the porosity of coal pile, the time of spontaneous combustion of coal pile is greatly shortened; the spontaneous combustion period of coal pile is positively correlated with the stacking height of coal pile, and changing the stacking angle has little effect on the spontaneous combustion of coal pile.