In order to get Xingtai 7623filling working face filling effect, through the use of UDEC discrete element analysis software, simulation analysis of upper overlying strata migration regularity ｕｎｄｅｒdifferent equivalence mining height backfill mining, upper overlying strata migration bending subsidence and surface deformation law and filling effect analysis.The successful appclication of the technology provided  reference for similar filling working face.