Abstract: The roof of the Huanglong Jurassic coalfield contains a thick aquifer of the Luohe Formation, which under the influence of high-intensity mining, has caused water inrush disasters and threatened the safety production of the mine.At present, research on the evolution of overlying strata delamination is mainly focused on single working faces.In response to the special engineering conditions of small coal pillar bi-directional skip mining in the 24 Panel area of Tingnan Coal Mine, the basic process and laws of overlying strata migration and delamination evolution were studied through 3DEC numerical simulation.The results indicate that delamination mainly exists in the lower key layers(sub key layers I,II,III) and below the main key layer.After the lower delamination gradually closes, its development eventually stops at the main key layer.The earliest time when delamination appears below the main key layer is after drilling on the first mining face; During the mining process in the mining area, the water conducting fracture zone changes in a “saddle shaped”,“arch shaped”,and “saddle shaped” pattern.The impact of the first mining face on the overlying rock is limited to a small range of the roof, while the subsidence has been transmitted to the surface after mining on the 2412 face.After mining on the three working faces, the overlying rock enters the overall stable subsidence stage.The research results are helpful in further exploring the influence of coal mining on the evolution of overlying strata movement, and can provide some reference for the prevention and control of water hazards in the delamination under similar conditions.