通过对耿村矿１３０１１综放面采空区“三带”的观测，证实了在采空区中部布置观测管路观测气体方案的可行性，采集的气体更具代表性．在分析观测数据的基础上确定了采空区“三带”的宽度范围，并结合耿村矿煤层自然发火期，指出了防止采空区遗煤自燃所必需的工作面最低推进速度，讨论了某一工作面在不同时期影响“三带”范围变化的主要因素，为防止采空区遗煤自燃提供了依据． Through the observation of the “three belts” in the gob of 13011 fully mechanized caving face in Gengcun Mine, the feasibility of arranging observing gas in the observation pipeline in the central part of goaf is confirmed. The collected gas is more representative. Based on the analysis of observation data, the width of “three belts” of goaf is determined. Based on the natural ignition period of coal seam in Gengcun Mine, the minimum advancing speed of working face to prevent spontaneous combustion of coal in goaf is pointed out. The main factors that affect the range of “three belts” at a certain working face in different periods provide the basis for preventing spontaneous combustion of coal in the goaf.