Abstract: Generally, the research on the rules of spontaneous combustion of working face is mainly focused on the prediction technology and the division of two-dimensional “three zones” of mined out area, but the study of the “three zones” in the three-dimensional space of the mined out area is relatively weak. The vertical distribution of “three zones” should also be taken into account in the composite mined out area with large caving height. Therefore, taking Wulan Coal Mine II020803 working face as the test face, a group of monitoring points are arranged respectively in the horizontal direction and vertical direction of the working face, through the field data, we analyze the distribution rules of spontaneous combustion “three zones” of II 020803 working face in composite goaf three-dimensional space, which makes up for the lacks of goaf in two-dimensional space “three zones” division, and improves the prediction accuracy of residual coal spontaneous combustion in composite goaf.