Abstract：Based on in-situ data，the four stages of fissures and the mechanism of ground movement and deformation caused by underground mining are analyzed. The results are drawn as follows. (1) Subsidence is shown of discontinuous movement，and it is found in concave region；the ground subsidence decreases，but increases in convex region. (2) The fissure can increase the displacement along with the mountain slope down ramp direction，and the increase is related to slope form，position of gob，and characteristics of surface. (3) The fissure can change the horizontal deformation properties. It can reduce tensile strain or increase the compression strain in the tensile strain region，or reduce compression strain or tensile strain in compression strain region，or increase strain in tensile or compression regions.
