Abstract: Superhigh-water material is a kind of filling material in goaf, whose water volume and water cement ratio can respectively reach 95%～97% and 11:1. Aiming at the shortcomings of goaf filling mining for nearly flat seam, partition filling mining with super high-water material is proposed. By analyzing the surface deformation, the results show that filling plays a decisive role in slowing down the land subsidence effectively. The success application in the Tianzhuang Coal Mine shows that super high-water material is a filling material with good performance in goaf filling and the technology of partition filling mining with super high-water material is an advanced filling mining method for nearly flat seam.