Abstract: In view of the prevention and control of the compound disaster of gas and coal spontaneous combustion in the super long working face with “U+L”type ventilation, this paper takes 205 coal mining face of Huangling Mining Company as an example. Simulation is used to analyze the laws of air leakage, the distribution laws of gas concentration and the distribution laws of oxygen concentration in the goaf, and the distribution of oxygen concentration is verified through the tube monitoring. It is concluded that the narrow “S” type area and closed contact lane formed by the superposition of gas and oxygen concentration field in the goaf are the major risk areas of coal spontaneous combustion resulting in explosion, and the corresponding prevention suggestions are proposed.