Abstract: The coal-bearing strata in the Hujierte mining area of the Ordos Basin are generally characterized by thick sandstone layers.After the initial mining face, the expansion of the mining range in adjacent working faces has led to significant movement and deformation of the thick rock layers, resulting in prominent dynamic hazards, which has increased the risk of roof disasters and exacerbated safety concerns.This paper, based on the engineering conditions of the adjacent goaf of the 3106 working face in the Menkeqing Mine, employs three-dimensional simulation methods to study the three-dimensional characteristics of overlying strata movement and patterns of bed separation evolution under the initial mining of the first working face and the secondary disturbance from adjacent face mining.The results indicate that the first working face, influenced by the thick-and-hard rock layers, exhibits minor subsidence and horizontal movement in the higher thick-and-hard strata.The bed separations formed at the top boundary of the fractured zone and within the bending zone in the middle of the working face develop with mining but don't easily close.After adjacent mining, the roof collapse area in the middle of the mined goaf no longer subsides, and the higher rock layers subside uniformly as a whole.The horizontal movement of the rock layers is minor, while the horizontal movement increases significantly at the side boundaries of the goaf.The higher bed separations continue to persist and don't completely close.Our research findings provide a reference for the analysis of the three-dimensional characteristics of overlying strata movement under thick and hard rock layer conditions, the design of in-situ monitoring positions for internal movement in ground boreholes, and the timing control of bed separation grouting in goaf areas.