Abstract: In order to the problems occurred by the great amount pressurized flowing water in the bed-separation after the traditional grouting and subsidence contr ol technology conducted in the overburden bed-separation, in combination with the basic performances of the super water material, based on the key strata theory of th e strata control as the guide, the grouting backfill technology with the super water material was provided for the overburden strata bed-separation and falling fractured z one.The technology would fully fill with the super water material in the bed-separation space, the space between the falling rocks of the faling zone and the cracks of th e fractured zone. After the grouting material solidified, the flled material could control the activities of the overburden strata. The previous practical results of the overbur den strata grouting and the application of the grouting and backfill technology to an imaginary coal mining face showed that the grouting and backfill with the super wate r material in the overburden strata bed-separation and falling fractured zone would have a subsidence reduction rate between 80%90% and would have a high productio n and high efficient coal mining in seam under the buildings, railway line and water body.