首先，利用大型煤自然发火实验台对煤的自燃特性进行了实验研究，测定了煤自燃在不同温度下的耗氧速度，CO和CO2的产生率，氧化放热强度以及自燃极限参数等，为自燃预测预报奠定了基础； 其次，对高瓦斯煤层综放工作面进行了现场观测，得到了抽放条件下采空区上、下巷的氧气、甲烷浓度及压力分布规律，分析得到采空区渗透系数随深度变化方程，通过现场实验得到采空区冒落带的高度分布规律，据此建立了高瓦斯煤层抽放条件下采空区渗流场和浓度场的三维模型； 然后，利用流体计算软件FLUENT对高瓦斯自燃煤层抽放条件下的综放采空区进行网格划分并对采空区渗流场和浓度场模型进行求解，得到高瓦斯煤层抽放条件下综放采空区漏风状况及各组分气体浓度分布，数值模拟结果与现场实际基本吻合； 最后，根据模拟结果，结合采空区三带划分理论，对高瓦斯煤层抽放条件下采空区自燃危险区进行判定，对自燃危险期进行预测，并计算出防止采空区自燃的工作面最小推进度。研究结果对高瓦斯煤层抽放条件下综放采空区自燃防治具有重要意义。

Firstly, the large experiment device of coal self-ignition is used to study the character, evaluate oxygen consuming rate, calculate CO and CO2 generating rate and heat releasing intensity of coal self-ignition. Critic parameters for spontaneous combustistion of oxgen concentration, loose coal thickness and air leakage intensity can also be studied through the experiment; Secondly, on-the-spot observation in the goaf of fully mechanized top-coal face in high-gas coal seam during the course of gas extraction are carried out, distribution of oxygen concentration, methane concentration and pressure in the goaf near the two laneways, and of pemeability in different places in the goaf are obtained. Distribution laws of collapsed height in the goaf are also obtained by on-the-spot observation. A three-dimension model of the flow, osmosis and concentration in the goaf of the high gas coal seam during the course of extracting gas are set up; Thirdly, the numeric model of air leakage and consistency in goaf of fully mechanized top-coal face in high-gas coal seams on condition of extracting gas is solved by using CFD software FLUENT. Distribution regulations of air leakage intensity and species concentration in goaf of fully mechanized top-coal face in high-gas coal seams on conditionof gas extraction are obtained which are identical on the whole to what from on-the-spot observation; Finally, the results of numeric modeling together with “three zone” theory are used to divide in goaf, the danger zone of coal self-ignition on condition of extracting gas, to predict the danger time of coal self-ignition and to calculate minimum velocity of mining to prevent coal from self-ignition in goaf are calculated. The result of the study is important for preventing coal self-ignition in goaf of fully mechanized top-coal face in high-gas coal seams during the course of extracting gas.