Abstract: The Flac3D of movement deformation of overburden rock is built, so as to do some relative research on the 31071 fully mechanized coal face of Henan Xindeng coal mine.The deformation and failure of the stress and displacement of strata under the condition of different mining height are studied in detail.The research findings show that, the overburden of caving zone,fracture zone increases accordingly,and the changes is obvious.At the same time,the distance of above the coal seam roof stress to redistribute also increased gradually with the increasing mining height.

Key words: Mining height of coal seam, Movement deformation of overburden rock, Impact analysis