Abstract: The article studies overburden rock movement form in extremely thin seam which is less than 0.8 m, puts forward movement form of extremely thin seam overburden, continuous slow sinking, which simplifies continuous movement overburden as mechanical model of elastic foundation continuous plate. The paper also deduces the calculated formula of roof deflection curves z₁, z₂ and pressure p₁, p₂. Using numerical simulation and investigation, the study determines the movement of Binlang Coal Mine in Dazhu Coal and Electricity Group is continuous slow sinking, and puts forward appropriate control measures.