Abstract: Based on the movement laws of roof strata and deformation characteristics, the feasibility of the ordinary concrete for roadside filling is analyzed, and it can meet the movement laws of the thick gray rock of the thin coal seam. The effect of the gob-side entry retaining in the width of different filling body is simulated by numerical simulation software FLAC^3D, and the width of the determined filling body is 1.5 m to 2.0 m; the supporting scheme of the concrete filling material is designed. The practice shows that the initial period of the roof is effectively controlled by the use of temporary support, which effectively compensates for the shortcomings of the initial setting time of concrete and the low initial setting strength. Using concrete as the filling material, it is well adapted to the movement of the thick gray rock in the goaf.