Abstract：In order to study the coal oxidation and temperature characteristics of complex air leakage in the underground fire zone, a big spontaneous combustion experimental platform was used and conducted the tests of coal oxidation and temperature characteristics under the conditions of continued leakage ( air supply volume is0. 6 m³/h) , micro-leakage ( air supply volume is 0. 6 m³/h→0) and intermittent leakage ( air supply volume is0. 4, 1. 2, 0. 4 m³/h) . The experimental obtains the impact properties of coal spontaneous combustion and temperature rising of wind flow for cooling and providing oxygen capacity under the continued leakage conditions, it was showed that“Breathing”phenomenon caused the oxidation and temperature mutation of coal. Especially after injection nitrogen replacing oxygen, the temperature of oxidation coal was very sensitive to repeated leakage; and the formation and evolution law of high temperature points were theoretically analyzed under the complex leakage condition. Through experiments the judgment rules of coal oxidation heat point are gotten in closed area, and a theoretical basis is provided for the spontaneous combustion controlling techniques in enclosed area.

Keyword：enclosed area;coal oxidation;complex air leakage condition;high temperature point;