Abstract: Influenced by the factors of early technology, economy and mine field division, many destruction areas of small coal mine are distributed in the upper coal seam of merger and reorganization mine. In order to reduce the waste of coal resources and geological disasters induced by the residual goaf, the re-mining of residual coal has important practical significance. In this paper, Hanzui coal mine #32101 working face thick seam fully mechanized caving mining as the engineering background, the similar simulation method is used to design the mining scheme, and the stability characteristics of surrounding rock and coal pillar in the upper layer goaf of #3 coal seam are inversed, the survey mark points are arranged and the simulation support is embedded, and the roof deformation law of fully mechanized top coal caving face passing through coal pillar and goaf is studied, the breaking rule of overlying rock in #32101 working face of Hanzui coal mine is revealed qualitatively. The results of this study provide experimental reference for the safe mining of the substituted working face in the mine field, and provide reference for the remining of the residual coal resources in the mine area under similar conditions.