Abstract: Technology of filling with materials of high water content has many advantages, such as process simplification, fast condensation, and stable performance.After filling with materials of high water content, the settlement deformation of surface deformation observation stations was studied.Experimental studies have shown significant reduction of surface subsidence.Since May 2009 the establishment of the settlement movement of surface observation stations to December 2009 the surface maximum subsidence was 165.6 mm after filling, the average monthly subsidence 20.7 mm.This method reduces more surface subsidence caused by mining than the traditional method of filling.The method has obvious effect and provides an effective new approch for coal mining under railway, buildings and the water body.