Abstract: In order to study the ground movement and deformation laws under different filling percentages of gangue backfill mining, a FLAC^3D numerical simulation software is applied to establish numerical models of backfill mining under different filling intensity based on a coal mine respectively. Through analyzing the influence of different filling percentages of gangue backfill on ground subsidence, it is obtained that with the increase of filling percentage, the better the effect of controlling surface subsidence is, the ground movement and deformation extremum value is associated with filling percentage change of linear relation; then combined with the equivalent mining height theory, the ground movement results are compared between caving mining of thin seam and gangue backfill mining, and the difference with the variation of filling percentage between the both maximum amount of movement were given.