Abstract: In order to study the overburden strata movement features during the mining process in in thick seam of Daping Coal Mine, the paper takes the mechanized mining engineering in S₂S₉ working face in Daping Mine as research object, and uses the numerical simulation to analyze the characteristics of the vertical stress field and displacement field. The paper obtains the rock vertical stress contours distribution laws, rock sinking characteristics and subsidence variation laws, which reveals the surface subsidence and horizontal movement characteristics after mining.