In order to solve the problem caused by the deformation of serious surrounding rock, severe air leakage, the worse result of retaining by using float coal pile method along the empty left lane in 3832 working face of Xin’an Coal Mine, this paper studies with the test by fly ash cementing material lane beside the filling for the technology, and determines the supporting parameters and filling system for process flow. The project application cases show that the roadway at the top of the lower and upper roof strata of roof strata abscission layer has been effectively controlled, the packing bag filling roadway air leakage has been effectively prevented, and is expected to achieve section pillar recovery benefit of RMB 13 719 552, and the scale of the filling mining has provided a project example and references for similar mines.