Abstract: In order to study strata movement and failure laws of isolated coal pillar with paste filling mining, and determine the threshold value of filling rate by using filling mining to control surface subsidence, based on the paste filling mechanism and the geological conditions, adopting similar material simulation method and theoretical analysis, the laws of strata movement caused by filling method and caving method separately are researched, and the filling rate threshold value of using filling mining to control surface subsidence is analyzed according to surface deformation law, and surface subsidence analysis is carried out by means of site test.