Abstract: In order to analyze the laws of spontaneous combustion in the face of fully mechanized top-coal caving face, the danger of spontaneous combustion in the face is determined. This paper studies the 3 lower 107 fully mechanized coal caving face in Tengdong Coal Mine. Firstly, oxygen concentration is taken as the main index, and temperature is used as an auxiliary index to divide the 107 face into spontaneous combustion “three zones”, and then the temperature measurement and sampling observation along the goaf are carried out at the 3 lower 107 fully mechanized caving face to establish a spontaneous combustion risk assessment model based on this, and a spontaneous combustion risk assessment was carried out at the working face. The study showed that the hazard level at the 3 lower 107 working face was 63.41%. The working face belongs to the working face which is extremely easy to ignite naturally.